Ethyldienolone, also known as 17ñ-methyl-19-nor-ô<sup>9</sup>-testosterone, as well as 17ñ-methylestra-4,9-dien-17ò-ol-3-one, is synthetic, orally active anabolic-androgenic steroid (AAS) and a 17ñ-alkylated derivative of 19-nortestosterone. It is slightly more active than methyltestosterone when given orally. Ethyldienolone is closely related to dienolone and methyldienolone.