/ Dictionary / Index C caustic: Meaning and Definition of Find definitions for: caus•tic Pronunciation: (kô'stik), [key] — adj. capable of burning, corroding, or destroying living tissue. severely critical or sarcastic: a caustic remark. —n. a caustic substance. Seecaustic curve. Seecaustic surface. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: caustic (Thesaurus) causist caustic alcohol Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language