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1. Capable of burning, corroding, dissolving, or eating away by chemical action.
2. Sarcastic or cutting; biting: "The caustic jokes ... deal with such diverse matters as political assassination, talk-show hosts, medical ethics" (Frank Rich).
3. Given to making caustic remarks: a caustic TV commentator.
1. A caustic material or substance.
2. A hydroxide of a light metal.
3. The enveloping surface formed by light rays reflecting or refracting from a curved surface, especially one with spherical aberration.
[Middle English caustik, from Latin causticus, from Greek kaustikos, from kaustos, from kaiein, kau-, to burn.]
caus·tic′i·ty (kô-stĭs′ĭ-tē) n.
a sharp, tart wittiness. Also causticness. — caustic, adj.See also: Language Style