əˈsēd. ə lˈfen ə lˈhīdrəˌzēn, ˈasəd. ə l-, -ˈfēn- noun
( -s )
Etymology: International Scientific Vocabulary acetyl + phenylhydrazine
: a white crystalline compound C 6 H 5 NHNHCOCH 3 less toxic than phenylhydrazine and used in the symptomatic treatment of polycythemia