A / ătăvĭa
noun

ătăvĭa

gen. ătăviae · gender feminine · decl. 1st
the mother of a great-great-grandfather; greatgreat-grandmother; a fourth grandmother
the mother of a great-great-grandfather (abavus) or greatgreat-grandmother (abavia), a fourth grandmother, opp. to adneptis, Dig. 38, 10, 1; 38, 10, 10.