The Collaborative International Dictionary of English v.0.48:

Scrotum \Scro"tum\, n. [L.] (Anat.)
   The bag or pouch which contains the testicles; the cod.
   [1913 Webster]

WordNet (r) 3.0 (2006):

scrotum
    n 1: the external pouch that contains the testes

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "scrotum":
   bag, ballocks, balls, basket, beard, breasts, cervix, clitoris,
   cod, cods, cullions, family jewels, female organs, genitalia,
   genitals, gonads, labia, labia majora, labia minora, lingam, lips,
   male organs, meat, nuts, nymphae, ovary, penis, phallus,
   private parts, privates, privy parts, pubic hair, pudenda,
   reproductive organs, rocks, secondary sex characteristic,
   sex organs, spermary, testes, testicles, uterus, vagina, vulva,
   womb, yoni