'Codpiece' definitions:

Definition of 'codpiece'

(from WordNet)
noun
(15th-16th century) a flap for the crotch of men's tight- fitting breeches

Definition of 'Codpiece'

From: GCIDE
  • Codpiece \Cod"piece`\, n. [Cod, n., ? + piece.] A part of male dress in front of the breeches, formerly made very conspicuous. --Shak. --Fosbroke. [1913 Webster]