Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ăsĭna, ae, f. (dat. and abl. plur. asinabus rest only on the assertion of Prisc. p. 733 P.; Rhem Pal. 1365 P., and Phoc. p. 1707 P.: asinis, Plin. 11, 40, 95, § 233, acc. to which it should be considered as masc.; cf. Schneid. Gr. II. p. 26; Charis. p. 39, and Rudd. I. p. 50, n. 31) [asinus].