Polynephria: applied to insects with many urinary (Malpighian) tubes.
Polyphagous: eating many kinds of food.
Polyphyletic: derived or descended from several stems or sources.
Polypodous: having many feet, and thus, specifically applied to the Myriapoda, and to the larvae of Lepidoptera and saw-flies, in contradistinction to footless and hexapodous larvae.
Ponderable: that which may be weighed.
Pone: behind (the middle).
Ponticulus: = frenulum; q.v.
Porcate: marked with raised longitudinal lines.
Pore: any small, round opening on the surface.
Poriferous: closely set with deep pittings or punctures.