Tetradac´tyle, a. Four-toed.

Thal´amus, n. A certain tract of the brain.

The´ca, n. Sheath.

The´nar, a. Palmar; plantar.

The´ory, n. Scientific speculation. Philosophical explanation. Result of inference from established principles.

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.)