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.