atavia

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

ătăvĭa, ae, f. [atavus],

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.