Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Mēninx, ngis, f., = Μῆνιγξ, an island off the coast of Africa, near the Lesser Syrtis, the modern Jerbah, Plin. 5, 7, 7, § 41; Liv. 22, 31, 2 (Weissenb. Menige); Mel. 2, 7, 7; Sol. 27, 40; Sil. 3, 318.