Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

caustĭcē, ēs, f., = καυστική, a caustic plant, called scelerata in pure Lat., App. Herb. 8.

caustĭcus, a, um, adj., = καυστικός, 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.