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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′ti·cal·ly adv.
caus·tic′i·ty (kô-stĭs′ĭ-tē) n.

causticism, causticity

a sharp, tart wittiness. Also causticness. — caustic, adj.
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Irony or bitterness, as of tone:
References in classic literature ?
Deane, he considered, was the "knowingest" man of his acquaintance, and he had besides a ready causticity of tongue that made an agreeable supplement to Mr.
To choose the color coated steel coil according to its use, causticity of service environment, service life and durability.
The film shows the causticity of the base ingredients, but it ignores the health effects of relaxers and weaves, as well as the growing natural hair movement.