Lewis Short
(adjective) = καυστικός: caustĭcus, a, um
* Burning, caustic, corrosive: natura,Plin. 27, 9, 54, § 77: vis,id. 32, 10, 52, § 140: spuma,a kind of soap with which the Germans colored their hair,Mart. 14, 26, 1.—Subst.: caustĭcum, i, n. (sc. medicamentum), a burning, corroding medicament, Plin. 26, 1, 3, § 3; 26, 8, 39, § 65; 34, 18, 56, § 178.
Charlton T. Lewis, Charles Short, A Latin Dictionary