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peni-, peno-, peo- (Greek > Latin: tail; male organ of copulation, the penis).


hemipenes:
hemipenis:
macropenis:
micropenis:
pencil:
penectomy:
penes:
penial:
penile:
penis:
penischisis:
penitis:
penorthosis:
penoscrotal:
penosugia:
penotherapy:
peotillomania:
peotomy: