'Penis' definitions:

Definition of 'penis'

From: WordNet
noun
The male organ of copulation (`member' is a euphemism) [syn: penis, phallus, member]

Definition of 'Penis'

From: GCIDE
  • Penis \Pe"nis\ (p[=e]"n[i^]s), n. [L.] (Anat.) The erectile external sexual organ of males, used in copulation, and in mammals, also for urination. [1913 Webster +PJC]