tonus, i, m., = τόνος. The stretching, straining of a rope: mollior, vehementior, Vitr. 10, 10, 6.

— Trop. Lit., the sound, tone, of an instrument, Vitr. 5, 4; Macr. Somn. Scip. 2, 1 med.; Mart. Cap. 9, § 959.

—Of the tone of a syllable, accent, Nigid. ap. Gell. 13, 25, 1 sq.

— Transf. Like our tone, in painting, of the natural color of an object, Plin. 35, 5, 11, § 29.

— For tonitrus, thunder, Sen. Q. N. 2, 56, 1.