O´tocrane, n. “Skull of the ear”; cavity containing essential organs of hearing.
Outer Covering. (142.) See Indumentum and Ptilosis.
Outer Web (of a feather). (150.) See Pogonium Externum.
O´val, O´vate, O´void, Ovoid´al, a. Egg-shaped; in a general sense, oblong and curvilinear. Distinctions which may subsist between these words are practically ignored among oölogical writers, who use them interchangeably for the oblong curvilinear shape when the curve is unequal at the opposite ends; the terms elliptical, ellipsoidal, being generally used to denote a curve equal at both ends. The transverse
contour-line of an egg being always circular, the descriptive terms refer to the lengthwise contour, considered either as of a surface or a solid.
Ova´rium, n.; pl. ovaria, O´vary, n.; pl. ovaries, Organ or tissue in which eggs originate; they subsequently acquire albuminous deposit, and, in birds, a calcareous shell, in the oviduct.
O´viduct, n. Tube conveying eggs from ovary to cloaca.
Ovip´arous, a. Producing eggs which are developed after exclusion from the body. Opposed to viviparous.
Oviposi´tion, n. Act of laying eggs.
O´visac, n. Ovarian cavity in which an egg originates. Graafian vesicle.