serum. A clear watery fluid moistening the surface of serous membranes or exudate resulting from inflammation of any of those membranes.
shaft. The part of a long bone between its ends.
shock. A sudden physical or mental disturbance.
sinus. A hollow cavity recess, or pocket in the body tissues.
skiagraph. A shadow. The production of photographs by means of Roentgen rays.
skin. The membranous covering of the body.
skiving. Splitting or paring materials for adjusting shields to surfaces on the foot.
slough. Necrosed tissue separated from living structure.
smallpox. Variola; an acute eruptive contagious disease.