Præpec´tus, n. Fore-breast; region of the craw. Not well distinguished from jugulum.
Premax´illary (bone), a. The foremost and principal bone of the upper jaw. Intermaxillary is synonymous.
Prep´uce, n. Foreskin. The homologous structure occurs in some birds. Preputial, pertaining to the foreskin.
Pressiros´tral, a. Having a bill like that of a plover. (Obsolete.)
Prester´num, n. Anterior segment of the breast-bone.
Pri´mary, n.; pl. primaries. Any one of the (usually ten, often nine, rarely eleven) large stiff quills growing upon the pinion or hand-bone, as distinguished from the secondaries which grow upon the forearm. They form the tip of the wing, and much of its surface.
Pri´mary Wing-coverts, n. pl. Those overlying the bases of the primaries.
Proce´res or Pro´ceri, n. pl. Same as Ratitæ (which see).
Prolig´erous, a. See Yolk.
Prona´tion, n. A particular movement of the radius upon the ulna, by which the hand turns over,—in birds it is very slight, if it occur at all. The reverse movement is termed supination. The muscles effecting it are pronators and supinators.