Part 181

THERMOG´ENOUS, a. Heat-producing, as all vital processes are.

THIGH, n. Segment of leg between hip and knee. (97.)

THORAC´IC, a. Pertaining to the chest.

THO´RAX, n. The chest; segment of the body enclosed by ribs, sternum, and certain vertebræ, containing heart and lungs.

THROAT, n. See GULA. (52.)

THUMB, n. In birds, the so-called thumb, upon which the alula, or bastard wing, grows, is homologically the index-finger. Penguins lack this segment.

THYROHY´AL, n. An element of the hyoid bone.

THY´ROID, a. Shield-shaped. Name of principal laryngeal cartilage.

THY´ROID CAR´TILAGE. One of those forming the larynx.

TIB´IA, n. Principal and inner bone of leg between knee and heel; the shin-bone.

TIB´IAL, a. Pertaining to the tibia.

TOE, TOES, n. (116.)

TOMIUM, n.; pl. tomia. The cutting edge of the bill. There is a superior or maxillary tomium, and an inferior or mandibular tomium; each is double (i.e. right and left); together they are the tomia, mutually apposed when the mouth is shut.

TOP OF TOES. (117.) See ACRODACTYLUM.

TOR´QUATE, a. Ringed; collared.

TOR´QUES, n. Ring or collar of color or of feathers otherwise distinguished. Lewis’s woodpecker has a cervical torques both in color and texture of the feathers.

TOTIPAL´MATE, a. Having all four toes webbed. Same as steganopodous.

TRACH´EA, n. Windpipe.

TRANSVERSE´, a. Crosswise; in direction at right angle with longitudinal axis of the body.

TREAD (of the cock), n. Cicatriculum; molecule. See YOLK.

TRI- (in composition). Thrice; treble.

TRI´CEPS, n. A certain extensor muscle of wing and leg.

TRIDAC´TYLE, a. Three-toed.

TRIGEM´IMUS, a. for n. A certain cranial nerve.

TRIHE´DRAL, a. Three-sided.

TRIV´IAL, a. Said of a specific name. Opposed to generic.

TROCHAN´TER, n. Prominence at top of femur.

TROCH´LEA, n. A pulley; smooth bony surface over which a tendon plays.