tŏnus — Lewis & Short
tŏnus, i, m., = to/nos.
I The stretching, straining of a rope:
mollior, vehementior,Vitr. 10, 10, 6. —
II Trop.
A 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.—
B Transf.
1 Like our tone, in painting, of the natural color of an object, Plin. 35, 5, 11, § 29.—
2 For tonitrus, thunder, Sen. Q. N. 2, 56, 1.