testis

from WordNet (r) 3.0 (2006)

testis
    n 1: one of the two male reproductive glands that produce
         spermatozoa and secrete androgens; "she kicked him in the
         balls and got away" [syn: {testis}, {testicle}, {orchis},
         {ball}, {ballock}, {bollock}, {nut}, {egg}]

from The Collaborative International Dictionary of English v.0.48

Testis \Tes"tis\, n.; pl. {Testes}. [L.] (Anat.)
   A testicle.
   [1913 Webster]