Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† 1. mnēster, ēris, m., = μνηστήρ, a wooer, suitor, pure Lat. procus: ad mnesteras, Hyg. Fab. 126.
2. Mnēster, ēris, m., a Roman surname: M. Lepidus Mnester, a pantomime, favorite of Caligula, Suet. Calig. 36; 55; 57.