ătăvus (archaic, -ŏs), i, m. [at avus], the father of a great-great-grandfather (abavus) or great-great-grandmother, opp. to adnepos.
I Lit., cf. Dig. 38, 10, 1, 38, 10, 10; Isid. Orig. 9, 5, 9 and 10; 9, 6, 23 and 25; Plaut. Pers. 1, 2, 5; Cic. Cael. 14.—
II In gen., sometimes, like avus, abavus, etc., for ancestor , forefather : Turnus avis atavisque potens, Verg. A. 7, 56: Evocat antiquis proavos atavosque sepulchris, Ov. Am. 1, 8, 17: Maecenas, atavis edite regibus, Hor. C. 1, 1, 1.