Absorption

A taking in or reception by molecular or chemical action.

Accessible

Refers to tumors that can be approached by a surgical procedure.

Acromegaly

A disease caused by the overproduction of growth hormone by the pituitary gland.

ACTH

Adrenocorticotropic hormone, corticotropin.

Acuity

Refers to clarity or distinctness of hearing or sight.

Acupuncture

The practice of inserting needles into the body with the aim of reducing pain.

Acute

Of short duration, rapid and abbreviated in onset.

Adenoma

A benign tumor that arises in or resembles glandular tissue.

ADH

Antidiuretic hormone, vasopressin.

Adhesion

Union of two tissue surfaces. Also, scar tissue that can form in the area of a previous operation.

Adjuvant

A therapy used in addition to or accompanying another treatment.

Adrenal Glands

A pair of endocrine glands which produce small quantities of vital hormones.

Allergen

A substance that is foreign to the body and, in some people, can cause an allergic reaction.

Allergy

A hypersensitivity of the body's immune system in response to exposure to specific substances (antigens).

Alopecia

Loss of hair; baldness in areas where hair is usually present. 

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