Penicillum: a pencil or brush of long hair attached at the end of a stalk as long as the brush, and folded in a lateral groove in some male moths.
Penis: the flexible, membranous, intromittent organ of the male.
Pennaceous: = pennate.
Fermate: feathered or bearing feather-like processes.
Penniform: feather-like in form.
Pentagon -um: a five-sided figure with five equal or unequal angles.
Pentamera: Coleoptera with 5-jointed tarsi. Pentamerous: species having five-jointed tarsi.
Penultimate: next to the last.
Peptone: a soluble proteid compound produced by the digestion of albummenoid food substances.
Per-: as a prefix, means very: extremely: through.