/ Dictionary / Index B bertrandite: Meaning and Definition of Find definitions for: ber•trand•ite Pronunciation: (bûr'trun-dīt"), [key] — n. a mineral, hydrous beryllium silicate, BeSiO(OH), colorless or pale yellow, with a vitreous luster, occurring as tabular or prismatic crystals in pegmatites and hydrothermal veins. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Bertrand Berw. Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language