ătăvus | -ŏs (noun M) : (archaic, ), , at avus
* The father of a great-great-grandfather (abavus) or great-great-grandmother, opp. to adnepos.
* 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.
* 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.

s. TLL