per-lībro, āvi, ātum, 1, v. a., to make exactly level, to level.
I Lit., Col. 3, 13, 13: permensum et perlibratum opus, id. 3, 13 fin. : planities non perlibrata, sed exigua prona, not level , not horizontal , id. 2, 2, 1: si quis Excelsa perlibrat, Sen. Q. N. 3, 27. —
II Transf., to hurl with a vibratory motion (poet.): saevamque bipennem Perlibrans mediae fronti, Sil. 2, 189: hastam, id. 5, 321: jaculum a tergo ad ossa, id. 15, 699.