Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Mēnas, ae, m., = Μηνᾶς, a freedman of Sextus Pompeius, his lieutenant and commander of the pirate-fleet, which, with the hope of greater gain, he traitorously delivered up to Augustus, Vell. 2, 73; 77; Plin. 35, 18, 58, § 200.