/ Dictionary / Index G ganister: Meaning and Definition of Find definitions for: gan•is•ter Pronunciation: (gan'u-stur), [key] — n. a highly refractory, siliceous rock used to line furnaces. a synthetic product similar to this rock, made by mixing ground quartz with a bonding material. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gangway ganja Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language