/ Dictionary / Index G gadolinite: Meaning and Definition of Find definitions for: gad•o•lin•ite Pronunciation: (gad'l-u-nīt"), [key] — n. a silicate mineral from which the rare-earth metals gadolinium, holmium, and rhenium are extracted. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gadolinite (Thesaurus) gadoid gadolinium Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language