Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ava, ae, v. avia.
1. ăvĭa, or in late Lat., ăva, ae, f. [avus], a grandmother on the father’s or the mother’s side: Matres duas habet et avias duas, Plaut. Truc. 4, 3, 34: anus avia, Curt. 3, 11, 25; Vulg. 2 Tim. 1, 5: avia tam paterna quam materna, Dig. 38, 10, 10: Inter avam et neptem tu mediata agas, Ven. Fort. 8, Carm. 18, 8.
Meton., a prejudice, as it were, inherited from a grandmother: dum veteres avias tibi de pulmone revello, old wives’ fables, Pers. 5, 92, ubi v. Gildersleeve.