Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ē-mascŭlo, āre, v. a. [masculus], to castrate, emasculate (post-class.): asinum, App. M. 7, p. 198: sacerdotes herbis quibusdam, i. e. to render impotent, Serv. Verg. A. 6, 661.