Dictionary

Enter a word or phrase below to search our online dictionary of over 1,300 general medical terms, or click on a letter of the alphabet to view all terms beginning with that letter:

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Search for 'F'

Phrase Definition
faint Temporary loss of consciousness because of an insufficient blood supply to the brain.
fallopian tube The tubal passageway connecting the ovary to the uterus.
familial cholesterolemia An inherited disorder causing abnormally high levels of cholesterol in the blood.
fascia Fibrous sheets of tissue connecting or covering the muscles.
fat A major energy source for animals and humans. Fat contains nine calories per gram.
fatigue Physical or mental exhaustion. Weariness.
feces Body waste expelled from the rectum. Also called bowel movement or stool.
femoral Having to do with the femur.
femur The thigh bone.
fertility The ability to have children.
fertilization The process of joining the male's sperm and the female's ovum (egg).
fetal Having to do with the fetus.
fetus The unborn baby from the end of the eighth week after fertilization of the egg to birth.
fever Abnormally high body temperature.
fiber 1. A slender, thread-like structure of organ tissue. 2. In the diet, strands of complex carbohydrates (cellulose) that aren't digestible.
fibrillation A rapid, uncoordinated series of contractions of some part of the heart muscle causing irregular heartbeats. Atrial fibrillation is the rapid, ineffective beating of the upper part of the heart. Ventricular fibrillation is the lethal rapid, ineffective beating of the lower part of the heart.
fibrin A serum protein that's essential for the clotting process.
fibroid A noncancerous tumor of the uterus composed of muscle fibers. Also called uterine myoma.
fibromyalgia A painful condition with multiple sensitive areas, called "tender points," affecting fibrous tissues, muscles, tendons and ligaments.
fibrositis Inflammation of fibrous tissues.
fibula The long, thin, outer bone of the lower leg.
fissure A narrow slit.
fistula An abnormal passage from an abscess, cavity or hollow organ to the skin or another abscess.
flaccid Soft and flabby. Often used to describe complete paralysis (loss of movement) without muscle spasm.
flatfoot A condition in which the normal arch of the foot is absent.
flatulence Excessive production of gas in the intestines or stomach.
fluorescein A compound used as a diagnostic aid to show injuries of the cornea or retina of the eye.
folic acid Folacin. One of the B-group vitamins essential for forming red blood cells.
folliculitis Inflammation of the hair follicles.
fontanelle A soft spot in the skull of an infant formed by the normal separation between the bony plates of the skull.
foreskin A loose fold of skin covering the tip of the penis.
fracture Broken, especially a broken bone.
fraternal twins Twins formed from two separate eggs that were fertilized at the same time. They may be the same or different genders and they have different genetic makeups. Also called dizygotic twins.
frenulum A fold of skin or mucous membrane that limits the movement of a body part. For example, the frenulum linguae is the midline fold under the tongue that attaches it to the floor of the mouth.
frigidity An inability to be sexually aroused.
fructose Fruit sugar.
fungus A group of organisms that includes yeasts, molds and mushrooms.