vī^trum, i, n. root in video, to see, as transparent; cf. Plin. 36, 26, 65, § 191, glass. Lit., Plin. 36, 26, 65, § 189; Cic. Rab. Post. 14, 40; Sen. Q. N. 1, 6, 5; Quint. 2, 21, 9; Prop. 4 (5), 8, 37: O fons Bandu siae, splendidior vitro, Hor. C. 3, 13, 1; 1, 18, 16: Bassa, bibis vitro, Mart. 1, 38, 2; Ov. H. 15, 157.

— Woad, a plant used for dyeing blue: Isatis tinctoria, Linn.; Vitr. 7, 14; Caes. B. G. 5, 14; Mel. 3, 6, 5; Plin. 35, 6, 27, § 46; 37, 8, 37, § 117.