Dictionary of Medical Terms

Gain a better understanding of medical terminology by searching our dictionary of more than 1,300 terms.

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All terms that start with the letter F

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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…
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…
frenulum

A fold of skin or mucous membrane that limits the movement of a body part. For example, the frenulum linguae…
frigidity

An inability to be sexually aroused.
fructose

Fruit sugar.
fungus

A group of organisms that includes yeasts, molds and mushrooms.