American Oxford Thesaurus
testicles
testicles plural noun the bull's testicles: testes, gonads; informal prairie oysters, mountain oysters, cojones, family jewels; vulgar slang balls, nuts, nads; Brit. bollocks.
Oxford Thesaurus
testicles
testicles plural noun gonads; N. Amer. informal cojones; vulgar slang balls, knackers, nuts, rocks; Brit. vulgar slang bollocks, goolies.