/tes tos"teuh rohn'/ , n.
1. Biochem. the sex hormone, C 19 H 28 O 2 , secreted by the testes, that stimulates the development of male sex organs, secondary sexual traits, and sperm.
2. Pharm. a commercially prepared form of this compound, originally isolated from bull's testes and now also produced synthetically, used in medicine chiefly for treatment of testosterone deficiency and for certain gynecological conditions.
[ 1930-35; testo- (comb. form of TESTIS) + STER(OL) + -ONE ]