facelift A cosmetic surgery procedure performed to tighten loose skin and muscles on the face, jaw, and neck.

fiber The indigestible nutrient found in fruits and vegetables that passes through the digestive tract without being absorbed. Fiber provides bulk to help keep your digestive tract functioning properly and also helps protect against colon cancer.

finasteride A medication for treating an enlarged prostate gland that is also used to treat male pattern baldness.

fistula An abnormal channel between two internal organs or leading from an internal organ to the skin.

flu See influenza.

folic acid A B vitamin essential for cell growth and repair and for production of red blood cells.

follicle-stimulating hormone A hormone produced in the pituitary gland that begins the production of sperm in the testicles.

foreskin A loose fold of skin that covers the head of the penis. The foreskin is removed during circumcision.

fracture A break in a bone.

free radicals See oxygen free radicals. FSH See follicle-stimulating hormone.

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