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Transf. A measure for liquids: frumenti denos modios et totidem olei libras, Suet. Caes. 38.
A balance, pair of scales: cum in alteram librae lancem animi bona imponebat, in alteram corporis, etc., Cic. Tusc. 5, 17, 51; cf. id. Fin. 5, 30, 91.
A water-poise, plummet-level, level, line: sin autem locus ... pari libra cum aequore maris est, Col. 8, 17, 4: libratur autem dioptris aut libris aquariis aut chorobate, Vitr. 8, 6, 1.—Hence, ad libram: alteram navem pluribus aggressus navibus in quibus ad libram fecerat turres, of equal height or of equal weight, Caes. B. C. 3, 40, 1.
Counterpoise, balance: contra flatus quoque pervicax libra Bononiensibus calamis, Plin. 16, 36, 65, § 161: aes et libra, v. aes.
The constellation Libra, The Balance, Verg. G. 1, 208; Ov. F. 4, 386; Plin. 18, 25, 59, § 221: felix aequato genitus sub pondere Librae, Manil. 4, 545.
Trop., a balance (poet.), Pers. 4, 10: animi cunctantis libra, Claud. Laud. Stil. 1, 75.