Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ăsĭnē, ēs, f., = Ἀσίνη, a town in Messenia, Plin. 4, 5, 7, § 15.
Hence, Ăsĭnae-us, a, um, adj., of Asine: sinus, Plin. 4, 5, 7, § 15; cf. Mann. Gr. 546.