=Em´bry-o.= The fœtus in its earlier stages of development, especially before the end of the third month. =Em-men´a-gogue.= A drug that aids or stimulates menstruation. =E-mul´sion.= An oily or resinous substance divided and held in suspension through the agency of an adhesive, mucilaginous, or other substance. =En´do-me´´tri-um.= The mucous membrane that lines the cavity of the uterus. =En-gage´ment.= The head is said to be engaged when the largest diameters have passed the inlet. =En´si-form.= Shaped like a sword. =Ep´i-si-ot´´o-my.= Surgical incision of the vulvar orifice laterally for obstetric purposes. =E-ro´sion.= An eating or gnawing away. =Er´y-the´´ma.= A morbid redness of the skin due to congestion of the capillaries, of many varieties. =E´ti-ol´´o-gy.= The study or theory of the causation of any disease. =Ex-co´´ri-a´tion.= Any superficial loss of substance such as that produced on the skin by scratching. =Ex´os-mo´´sis= (_Ex-os-mose_). Diffusion or osmosis from within outward. =Ex-san´guin-a´´tion.= An exhaustion of the blood from a part or the whole of the body. =Ex-trac´tion.= The process or act of pulling or drawing out, particularly the removal of a child by pulling either with hands or forceps. =Ex´tra-u´´ter-ine.= Situated or occurring outside of the uterus. =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. =Fon´ta-nelle´´.= Any one of the unossified spots on the cranium of a young infant. It is so named because it rises and falls like a fountain. =Fo-ra´men.= A hole or perforation, especially a hole in a bone. =Four-chette´.= The fold of mucous membrane at the posterior junction of the labia majora.