Cheek, n. Outside of base of lower jaw; also, the corresponding region of upper jaw. Compare Genæ and Malar Region. (26.) (The term is differently employed by various writers, and is at best not definite.)

Chin, n. Space between forks of lower jaw; upper throat. See Mentum. (46.)

Cho´roid, n. Vascular black membrane of the eye, between retina and sclerotic. Choroid plexus, a certain fold of the pia mater.

Chyle, n. A certain intestinal fluid resulting from digestion.

Chyme, n. A certain product of incompleted digestion.

Cicatric´ula, n. Dark spot on the surface of a fecundated yolk. See Yolk.

Cil´iated, a. Bristly; furnished with bristles, or small bristle-like feathers; fringed.

Cil´ium, n.; pl. cilia. Bristly or hair-like feather, about the mouth and eyes especially. See Vibrissa and Seta.

Cine´reous, a. Of an ashy color.

Circum- (in composition). Around; about: as, circumanal, circumorbital, circumaural,—around the anus, orbit, ear, etc.