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n. the quality of being caustic

n. The property of being caustic, that is, of corroding or disorganizing animal matter, or the quality of combining with the principles of organized substances so as to destroy the tissue; corrosiveness. This property belongs to concentrated acids, pure alkalis, and some metallic salts.

n. Figuratively, severity of language; pungency; sarcasm.

"His tone dripped causticity like acid from a ruptured battery."

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