/ Dictionary / Index M marlstone: Meaning and Definition of Find definitions for: marl•stone Pronunciation: (märl'stōn"), [key] — n. an indurated marl. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: marlstone (Thesaurus) Marlowe marmalade Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language