Se-cre´tion. 1. The process or function of separating various substances from the blood. 2. Any secreted substance.

Sec´un-dines. All that remains in the uterus after the birth of the child is called secundines—placenta, membrane and cord.

Se´men. 1. A seed or seed-like fruit. 2. The thick whitish liquid fecundating secretion produced in coition.

Shock. Sudden vital depression, due to an injury or emotion which makes a sinister impression upon the nervous system.

Show. The appearance of blood that foreruns a labor or menstruation.

Sin´a-pism. A plaster or paste of ground mustard-seed; a mustard plaster.

Sin´ci-put. The portion of the head lying in front of the anterior or large fontanelle.

Si´nus. 1. A recess, cavity or hollow space. 2. A dilated channel for venous blood, found chiefly within the cranium and uterus during gestation. 3. An air-cavity, in one of the cranial bones, especially one communicating with the nose, such are the ethmoidal frontal maxillary and sphenoidal sinuses. 4. A suppurating channel or fistula.

Smeg´ma. A thick, cheesy, ill-smelling secretion found under the prepuce and around the labia minora.

So-lu´tion. 1. The process of dissolving. 2. A liquid containing dissolved matter.