Dictionary![]() ![]() caus•ticPronunciation: (kô'stik), [key] —adj. 1. capable of burning, corroding, or destroying living tissue. 2. severely critical or sarcastic: a caustic remark. —n. 1. a caustic substance. 2. Optics. a. See caustic curve. b. See caustic surface. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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