/ Dictionary / Index G grain refiner: Meaning and Definition of Find definitions for: grain' refin"er Pronunciation: [key] — Metall. Metall. any chemical added to a molten metal or alloy to check grain growth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. grain itch mite grains Related Content Daily Word Quiz: supercilious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language