/ Dictionary / Index B beryllonite: Meaning and Definition of Find definitions for: be•ryl•lon•ite Pronunciation: (bu-ril'u-nīt"), [key] — n. a mineral, sodium beryllium phosphate, NaBePO, occurring in colorless or light-yellow crystals, sometimes used as a gemstone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. beryllium copper Berzelius 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