egg -- (animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds)
egg, eggs -- (oval reproductive body of a fowl (especially a hen) used as food)
testis, testicle, orchis, ball, ballock, bollock, nut, egg -- (one of the two male reproductive glands that produce spermatozoa and secrete androgens; "she kicked him in the balls and got away")