Ex´´u-da´tive di-ath´e-sis. A congenital predisposition to eczema in various parts of the body, as well as to infections of the respiratory tract.

Fæ´ces (or fe´ces). The excrement or undigested residue of the food discharged from the bowels.

Fen´es-tra-ted. (L., fenestrum, a window.) Pierced with one or more openings, like windows.

Fer´ment. Any substance that causes fermentation in other substances with which it comes in contact.

Fi´brin. A substance which, becoming solid in shed blood, plasma and lymph, causes the coagulation of these fluids.

Fil´let. 1. A loop-shaped structure. 2. A loop, as of cord or tape, for making traction.

Fis´sure. A cleft or groove, normal or other.

Fis´tu-la. A deep, sinuous ulcer, often leading to an internal hollow organ.

Flu´id ex´tract. A concentrated solution of the active principle of a drug in such strength that 1 c.c. of the product equals 1 gr. of the crude drug. The fluid is a mixture of alcohol, water and glycerine in varying proportions. One may be omitted.

Fœ´tus (or fe´tus). The unborn offspring of any animal that brings forth living progeny; the child in the womb after the third month.