/ Dictionary / Index M Marsh's test: Meaning and Definition of Find definitions for: Marsh''s test" Pronunciation: [key] a test to detect minimal amounts of arsenic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. marsh pink marsh tacky Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language