Synonym for ethisterone ... <chemical> 17 alpha-hydroxypregn-4-en-20-yn-3-one. A synthetic steroid hormone with progestational effects. ... Pharmacological action: progestational hormones, synthetic. ... Chemical name: Pregn-4-en-20-yn-3-one, 17-hydroxy-, (17alpha)- ... (12 Dec 1998) ... 
Type: Term Pronunciation: preg′nēn-in′ō-lōn, preg-nēn′in-