Protolog: the original description by words.
Protoloma: the anterior margin of primaries.
Protomesal: applied to certain areolets in Hymenoptera, situated between costal cells and apical margin.
Prototergite: the foremost dorsal segment of abdomen.
Preto-thorax: = prothorax: q.v.
Prototype: a primitive form to which later forms can be traced.
Protractor: that which extends or lengthens out: applied to muscles.
Protuberance: any elevation above the surface.
Protuberant: rising or produced above the surface or general level.
Proventriculus: the posterior portion of crop: the gizzard.