Sac´cha-rine (L. sac´charum, sugar). Of the nature of sugar; applied to the important group of food substances which embraces the different varieties of sugar, starch, and gum.

Sa-li´va (L.). The moisture or fluids of the mouth, secreted by the salivary glands, etc.

Scle-rot´ic (Gr. σκληρός, skleros, hard). The tough, fibrous outer tunic of the eyeball.

Se-ba´ceous (L. sebum, fat). Resembling fat, the name of the oily secretion by which the skin is kept flexible and soft.

Se-cre´tion (L. secer´no, secre´tum, to separate). The process of separating from the blood some essential important fluid; which fluid is also called a secretion.

Sem-i-cir´cu-lar Canals. A portion of the internal ear.

Sen-sa´tion. The perception of an external impression by the nervous system; a function of the brain.

Sen-si-bil´i-ty, General. The power possessed by nearly all parts

of the human body of recognizing the presence of foreign objects that come in contact with them.

Se´rum (L.). The watery constituent of the blood, which separates from the clot during the process of coagulation.