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Glossary of Terms

The ability of a caregiver to obtain appropriate veterinary services for a pet.

Access to Care

Beginning suddenly and usually lasting for a short period of time.

Acute

An added treatment used to support or enhance the main treatment.

Adjunct

Unwanted or harmful effects that occur after a medication or treatment.

Adverse Effects

Pain caused by a stimulus that does not normally cause pain.

Allodynia

Relating to conventional medical treatment, especially drug-based or surgery-based care.

Allopathic

The chief components of proteins, synthesized by living cells or provided through the diet. Of the 22 amino acids, 10 are essential for cats. These essential amino acids are not produced by the cat's body and must be provided in the diet.

Amino acids

Relief from pain.

Analgesia

Medications or treatments that reduce pain.

Analgesics

A decrease in red blood cells or hemoglobin that reduces the blood’s ability to carry oxygen.

Anemia

A controlled loss of sensation or awareness used to prevent pain during procedures.

Anesthesia

Medications that reduce or block sensation, pain, or awareness during procedures.

Anesthetics

An abnormal bulging or widening of a blood vessel wall.

Aneurysm

Loss of appetite or refusal to eat.

Anorexia

Loss or reduction of the sense of smell.

Anosmia

Grief experienced before an expected loss occurs.

Anticipatory Grief

A substance that helps limit cell damage caused by free radicals.

Antioxidant

A medication or substance used to reduce anxiety.

Anxiolytic

Loss of normal coordination or balance.

Ataxia

Shrinkage or wasting of tissue, muscle, or an organ.

Atrophy

Conditions in which the immune system mistakenly attacks the body’s own tissues.

Autoimmune Disorders

Increased nitrogen-containing waste products in the blood, often associated with reduced kidney function.

Azotemia

Used to describe a tumor that is not malignant (cancerous). The names of these tumors usually end in the suffix -oma; for instance, lipoma. Even if a tumor is benign, its location or size can cause problems. For instance, a small benign tumor in the brain could be trouble, or a benign tumor could grow so large that it disrupts the function of other organs.

Benign

A community of microorganisms attached to a surface and protected by a self-produced coating.

Biofilm

Measurable biological signs used to assess health, disease, or response to treatment.

Biomarkers

A shortened head and muzzle shape, commonly seen in flat-faced breeds.

Brachycephaly

Disease-related weight and muscle loss that is not fully corrected by eating more food.

Cachexia

Hardened mineralized plaque that forms on teeth.

Calculus / Tartar

A substance that causes cancer.

Carcinogen

Smooth connective tissue that cushions joints and supports body structures.

Cartilage

Clouding of the eye’s lens that can interfere with vision.

Cataract

The use of chemicals or drugs to treat disease, usually cancer.

Chemotherapy

Long-lasting or recurring over time.

Chronic

The tissue that produces the eye's fluid.

Ciliary body

A decline in mental function that may affect memory, learning, awareness, sleep, or behavior.

Cognitive Dysfunction

Reduced ability to think, learn, remember, or respond normally.

Cognitive Impairment

A state of unconsciousness in which the patient cannot be awakened.

Coma

Care focused on relieving discomfort and maintaining quality of life.

Comfort Care

Occurring at the same time as another disease or medical condition.

Comorbid

A disease influenced by multiple factors rather than a single clear cause.

Complex Disease

Intense or prolonged grief that interferes with normal daily life.

Complex Grief

Retinal cells that support color vision and detailed vision in brighter light.

Cone Cells

A condition that exists at birth, but is not necessarily hereditary.

Congenital

The pink mucous membrane that lines the inner surface of the eyelids and the front part of the eyeball.

Conjunctiva

Veterinary care adapted to the pet’s needs and the caregiver’s goals, resources, and circumstances.

Contextualized Care

The transparent anterior portion of the outer fibrous coat of the eye.

Cornea

An abnormal change or deposit in the cornea, often inherited and usually not caused by inflammation.

Corneal Dystrophy

A painful defect or wound on the surface of the cornea.

Corneal Ulceration

A prepared set of emergency medications or supplies used during an urgent medical situation.

Crash Kit

The use of controlled freezing to remove or destroy diseased tissue.

Cryotherapy

Pain arising from deeper tissues such as muscles, joints, bones, or connective tissue.

Deep Somatic Pain

A sudden, fluctuating change in awareness, attention, or mental function.

Delirium

A progressive decline in memory, learning, awareness, or other cognitive abilities.

Dementia

A state of reduced mood, energy, interest, or responsiveness.

Depression

Inflammation of the skin.

Dermatitis

A condition in which the body is unable to metabolize carbohydrates; indicated by excessive thirst and urination, excessive amounts of sugar in the blood, and excessive hunger and loss of weight.

Diabetes mellitus

A drug derived from the foxglove plant; used to improve function of the heart muscle.

Digitalis

A disorder or abnormal condition that affects normal body function.

Disease

The expected course or pattern of a disease over time.

Disease Trajectory

Grief that is not fully recognized, understood, or supported by others.

Disenfranchised Grief

A substance that causes increased production of urine.

Diuretic

Reduced tear production or poor tear quality that can irritate or damage the eye surface.

Dry Eye

Reduced saliva production that can make the mouth dry and uncomfortable.

Dry Mouth

A state of agitation, unease, or abnormal distress.

Dysphoria

Any gland, such as the thyroid or pituitary, that secretes hormones.

Endocrine gland

Relating to the inside of the tooth, especially the pulp and root canal.

Endodontic

Surgical removal of an entire tumor or organ, such as the eye from its socket.

Enucleation

A large, three-dimensional molecule/ complex protein that initiates chemical changes in the body.

Enzyme

An estimate of biological age based on chemical changes that affect gene activity.

Epigenetic Age

Fluid that leaks from tissue or a wound during inflammation.

Exudate

Connective tissue that surrounds, supports, and separates muscles and organs.

Fascia

An upper respiratory virus against which cats are vaccinated.

Feline Calicivirus (FCV)

An infectious disease that cannot be prevented and is transmitted between cats via bite wounds.

Feline Immunodeficiency Virus (FIV)

A virus against which cats are vaccinated that can be highly contagious to other cats.

Feline Leukemia Virus (FeLV)

A virus whose symptoms resemble parvovirus in dogs, and against which cats are vaccinated.

Feline Panleukopenia

An upper respiratory disease against which cats are vaccinated.

Feline Rhinotracheitis (FVR)

Reduced physical reserve that makes an older patient more vulnerable to illness, injury, or stress.

Frailty

Highly reactive molecules that can damage cells through oxidative stress.

Free Radicals

Factors or exposures that may accelerate ageing or age-related decline.

Gerontogens

Inflammation of the gums.

Gingivitis

Increased pressure within the eye.

Glaucoma

An anti-inflammatory, immunosuppressive corticoid, such as hydrocortisone, that affects the metabolism of glucose.

Glucocorticoid

An end-of-life experience with minimal fear, pain, and distress.

Good Death

The emotional process of responding to loss.

Grieving

A decreased response to a repeated stimulus over time.

Habituation

The portion of life spent in good health and functional ability.

Healthspan

The formation of blood cells.

Hematopoiesis

Brain injury caused by bleeding in or around the brain.

Hemorrhagic Stroke

A condition in which excess fat accumulates in the liver and interferes with liver function.

Hepatic Lipidosis

Inflammation of the liver.

Hepatitis

A condition that is transmitted from parent to offspring.

Hereditary

End-of-life care focused on comfort and quality of life rather than cure.

Hospice

A naturally occurring substance in joint fluid and connective tissue that helps lubricate and cushion tissues.

Hyaluronan

Increased sensitivity to a stimulus that is normally painful.

Hyperalgesia

Increased sensitivity to touch or stimulation.

Hyperesthesia

Persistently high blood pressure.

Hypertension

Reduced production of stomach acid.

Hypochlorhydria

Reduced sensitivity to touch or stimulation.

Hypoesthesia

An abnormally low concentration of glucose in the blood; low blood sugar.

Hypoglycemia

Reduced appetite.

Hyporexia

Caused unintentionally by medical treatment or intervention.

Iatrogenic

Occurring without a known cause.

Idiopathic

A drug or chemical that can suppress an immune response.

Immunosuppressive

The stimulation or suppression of immune response; i.e., vaccines to stimulate immunity or corticosteroids to suppress immune response.

Immunotherapy

Inability to control urination; passive urination at rest or during sleep.

Incontinence

A scale, score, or measurement used to summarize a condition or level of risk.

Index

Pain caused by inflammation and the chemical signals released during tissue injury or disease.

Inflammatory Pain

Supplied by nerves.

Innervated

Combining conventional medical care with complementary therapies when appropriate.

Integrative

Thinning or weakening of the iris, often associated with ageing.

Iris Atrophy

Brain injury caused by reduced or blocked blood flow.

Ischemic Stroke

Yellow discoloration of the skin, eyes, or mucous membranes caused by excess bilirubin.

Jaundice

Displacement of the eye’s lens from its normal position.

Lens Luxation

Age-related hardening or cloudiness of the lens that usually causes a bluish haze.

Lenticular Sclerosis

Reduced energy, alertness, or activity.

Lethargy

The total length of time an individual lives.

Lifespan

Strong connective tissues that connect bones to other bones.

Ligaments

A medication that blocks sensation in a specific area of the body.

Local Anesthetic

Cancer of the lymph nodes; the most common type of cancer in cats.

Lymphoma

In people, deterioration of the macula, the central part of the retina responsible for sharp central vision.

Macular Degeneration

A condition that is resistant to treatment and frequently fatal, i.e. malignant tumors. A malignant condition is one that exhibits uncontrollable growth with invasiveness or dissemination to other organs. Malignant skin tumors usually end with the suffix -carcinoma or -sarcoma.

Malignant

A type of connective tissue cell that plays a role in the formation and storage of certain active substances. Mast cells are found in higher concentrations in areas that are inflamed.

Mast cell

A crescent-shaped pad of cartilage that cushions and stabilizes a joint.

Meniscus

All biochemical processes in the body; the process by which cells assimilate food and create energy. Occurs through chemical changes in body tissues.

Metabolism

The spreading of a disease or tumor from one part of the body to another.

Metastasis

Abnormally small head size, often associated with abnormal brain development.

Microcephaly

Constriction of the pupil.

Miosis

The process by which a cell divides to produce two new cells.

Mitosis

Using more than one type of treatment or approach at the same time.

Multimodal

Relating to the muscles and bones.

Musculoskeletal

Dilation of the pupil.

Mydriasis

Death of cells or tissue.

Necrosis

Inflammation of the kidney.

Nephritis

Pain that follows the path of a nerve.

Neuralgia

Pain caused by disease or injury of the somatosensory nervous system.

Neuropathic Pain

Disease, damage, or dysfunction of nerves.

Neuropathy

Pain caused by the activation of pain receptors in response to actual or threatened tissue injury.

Nociceptive Pain

Pain caused by altered pain processing without clear evidence of tissue injury or nerve damage.

Nociplastic Pain

Brain injury caused by illness or internal events rather than external force.

Non-Traumatic Brain Injury

Age-related hardening of the central portion of the lens.

Nuclear Sclerosis

Involuntary, repetitive eye movements.

Nystagmus

Animals that can eat both plant-based and animal-based foods.

Omnivores

Surgical removal of the ovaries and uterus; called a spay.

Ovariohysterectomy

Ingredients added to food to improve smell, taste, or appeal.

Palatants

Care focused on relieving symptoms and improving comfort during serious illness.

Palliative Care

To examine by feeling and pressing with the palms of the hands and the fingers.

Palpate

Inflammation of the pancreas.

Pancreatitis

An abnormal sensation such as tingling, prickling, or “pins and needles.”

Paresthesia

The kneecap.

Patella

Pain that persists beyond its protective purpose and becomes harmful or self-sustaining.

Pathological Pain / Maladaptive Pain

Hospice-style care for pets near the end of life.

Pawspice

Relating to the tissues that surround and support the teeth.

Periodontal

Inflammation and damage of the tissues supporting the teeth, often following untreated gingivitis.

Periodontitis

Damage or disease affecting nerves outside the brain and spinal cord.

Peripheral Neuropathy

A cataract surgery technique that uses ultrasound to break up and remove the lens.

Phacoemulsification

Pain felt in a body part that is no longer present.

Phantom Pain

The study of how genetic differences affect response to medications.

Pharmacogenetics

The observable traits or characteristics of an individual.

Phenotype

Chemical signals released by animals that can influence behavior or communication within the same species.

Pheromones

Walking with the full sole or bottom of the foot touching the ground.

Plantigrade

A soft film of bacteria and debris that forms on teeth.

Plaque

Increased frequency and amount of water consumption stimulated by excessive thirst.

Polydipsia

The use of multiple medications at the same time, especially when this increases complexity or risk.

Polypharmacy

Increased frequency and amount of urination.

Polyuria

Pain that occurs after a surgical procedure.

Post-Surgical Pain

Age-related hearing loss.

Presbycusis

The foretelling of the probable course of a disease.

Prognosis

Medications that affect mood, behavior, perception, or mental function.

Psychotropics

An excessive accumulation of fluid in the lungs.

Pulmonary edema

A measure of overall comfort, well-being, and ability to enjoy normal activities.

Quality of Life

Pain that spreads from one area of the body to another.

Radiating Pain

The machine used to produce an image (a radiogram) on X ray film. The image is created by exposure to X rays. Commonly but incorrectly referred to as an X ray.

Radiograph

Pain felt in an area different from the actual source of injury or disease.

Referred Pain

Retinal cells that support vision in dim light.

Rod Cells

An inflammatory disease in which clusters of immune cells form in one or more organs.

Sarcoidosis

Age-related loss of skeletal muscle mass, strength, or function.

Sarcopenia

A dense, fibrous, opaque, white covering that encloses the eyeball, except for the cornea.

Sciera

A calm, drowsy state caused by medication or illness.

Sedation

The biological process of ageing; in cells, a state in which cells stop dividing but remain active.

Senescence

The physical and mental infirmity caused by old age.

Senility

Substances intended to selectively remove senescent cells.

Senolytics

Surgical removal of the ovaries and uterus; also called an ovariohysterectomy

Spay

The level of care expected from a reasonably competent veterinarian in similar circumstances.

Standard of Care

The accepted methods, procedures, or routines commonly used within a profession.

Standard of Practice

Anti-inflammatory medications that mimic corticosteroid hormones and affect inflammation or immune activity.

Steroids

Abnormal alignment of the eyes.

Strabismus

A state of greatly reduced responsiveness in which strong stimulation is needed to produce a response.

Stupor

Beneath the skin.

Subcutaneous

Pain arising from surface tissues such as the skin or mucous membranes.

Superficial Somatic Pain

A noticeable change that signals a shift in health, disease progression, or care needs.

Symptom Signpost

A group of signs or symptoms that commonly occur together.

Syndrome

The lining of a joint that produces lubricating synovial fluid.

Synovial Membrane

A hard yellow coating on the teeth consisting of food residue, saliva and salts such as calcium carbonate.

Tartar

Strong connective tissues that attach muscles to bones.

Tendons

The production of heat by the body.

Thermogenesis

Poisonous.

Toxic

Physical injury caused by an external force.

Trauma

Means "urine in the blood." This accumulation of waste products, such as urea nitrogen, in the blood is due to kidney failure and causes toxicity and death.

Uremia

The canal through which urine is expressed from the bladder.

Urethra

Inflammation of the urethral lining.

Urethritis

Inflammation of the uvea, the middle layer of the eye.

Uveitis

Loss of coordination or balance caused by dysfunction of the vestibular system.

Vestibular Ataxia

Pain arising from the internal organs.

Visceral Pain

Gentle, routine hands-on checking of a pet’s body to notice changes in comfort, condition, or health.

Wellness Touching

A disease that can be transmitted between humans and animals.

Zoonosis

Zoonosis

Cats & Dogs: Senior Wellness, © Ayrshire House Publishing, 2026

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