/ Dictionary / Index A acidulous: Meaning and Definition of Find definitions for: a•cid•u•lous Pronunciation: (u-sij'u-lus), [key] — adj. slightly sour. sharp; caustic: his acidulous criticism of the book. moderately acid or tart; subacid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acidulous (Thesaurus) acidulent aciduric Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language