Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. Mĕgăra, ae, m., a Numantine, Flor. 2, 18, 4.
2. Mĕgăra, ae, f., and Mĕgăra, ōrum, n. (abl. plur. Megaribus for Megaris, Plaut. Pers. 1, 3, 57), = τὰ Μέγαρα.
3. Mĕgăra, ae, f., wife of Hercules, whom, in his madness, he destroyed, together with her children, Hyg. Fab. 31.
Mĕgărus, a, um, adj. [2. Megara], of or belonging to the city of Megara, Megarean (poet.): sinus, Verg. A. 3, 689.