A codpiece is a covering flap or pouch that attaches to the front of men's trousers and was popular in Europe during the 16th century. The term 'codpiece' comes from its resemblance to the body part of a codfish. The crossword solutions for the term 'codpiece' are FIN (3 letters), GILL (4 letters), and HARDC (5 letters). FIN refers to the fish, GILL is a type of organ found in fish, and HARDC is an archaic spelling of the word 'HARD, ' which describes the material used to make codpieces.