/ Dictionary / Index A acid test: Meaning and Definition of Find definitions for: ac'id test' Pronunciation: [key] a severe and conclusive test to establish quality, genuineness, worth, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acid soil acid test ratio 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