prŏ-ăvus (noun M) : (
* Gen. plur. proavūm, Stat. Th. 10, 807), m.
* A grandfather's or grandmother's father, a great-grandfather (class.): pater, avus, proavus, abavus, atavus, tritavus,Plaut. Pers. 1, 2, 5; cf. id. Mil. 2, 4, 20: proavus et avus,Cic. Mur. 7, 15; cf. Dig. 38, 10, 1; 10.
* Transf., forefather, ancestor: in censurā de proavo multum cogitato tuo, i. e. of Appius Claudius Coecus, Cic. Fam. 3, 11, 4; Curt. 6, 11, 26; Hor. A. P. 270; Ov. Am. 3, 15, 5; Stat. Th. 10, 807: felices proavorum atavi,Juv. 3, 312.

s. TLL