Part 139

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

CIRCUMDUC´TION, n. Movement of a limb by which, if completed, a cone is described.

CIRRH´OUS, a. Tufted.

CLASS, n. Fundamental division of animals: the class of Birds; the class Aves.

CLASSIFICA´TION, n. Systematic arrangement.

CLAV´ICLE, n. Collar-bone. In birds, the two clavicles usually unite to form the furculum, merry-thought or wish-bone.

CLAVIC´ULAR, a. Pertaining to the clavicles.

CLAW, n. (121.)

CLAW-JOINT, n. (122.) See RHIZONYCHIUM.

CLIT´ORIS, n. Erectile venereal organ of the female, homologue of the male penis, present in some birds.

CLOA´CA, n. Enlarged lower end of straight gut, receptacle of products of genito-urinary system and refuse of digestion.

CLUTCH, n. Nest-complement of eggs.

CNE´MIAL, a. Pertaining to the crus or shin. Equivalent to crural.

CNEMID´IUM, n. End of crus, naked in most wading birds.

COCCYGE´AL, a. Pertaining to the tail, especially to its bones; synonymous with caudal.

COC´CYX, n. The tail, as to its bones collectively. Os coccygis. Any one of the tail-bones, or coccygeal vertebræ.

COCH´LEA, n. A certain portion of the inner ear.

CŒ´CUM, n.; pl. cœca. See CÆCUM.

CŒ´LIAC, a. Pertaining to certain of the abdominal viscera. Little used, excepting as the name of a certain artery, the cœliac axis.

COI´TUS, n. Sexual intercourse.

COL´LAR, n. Ring of color around neck. See TORQUES. (55.)

COL´LUM, n. Neck; part of body between and connecting head and trunk. (47.)

COLORA´TION, n. Coloring; pattern or mode of coloring, or the colors collectively.

COLUMEL´LA, n. Bone or cartilage of the inner ear of Sauropsida, answering to the stapes of mammalia.

COMB, n. Erect fleshy lengthwise process, or caruncle, on top of head, as in the domestic cock.

COMMIS´SURAL POINT. Point where the apposed edges of the mandibles meet and join; corner of the mouth. Equivalent to angle of the mouth, angulus oris.

COM´MISSURE, n. (Lat. con and mitto, to put or lay together.) Line of closure of the two mandibles; track or trace of their apposed edges when the jaws are closed. Often improperly used to signify the opening between the mandibles; but this is apertura oris, gape, rictus. Commissure is the whole rima oris, outline of the mouth, when such outline of upper and under jaw is made one in closure of the mouth.

COMPLEX´US, n. Name of a certain cervical muscle.