/ Dictionary / Index C caustic curve: Meaning and Definition of Find definitions for: caus'tic curve' Pronunciation: [key] — Optics. Optics. a curve formed by a plane section of a caustic surface. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. caustic baryta caustic lime Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language