/ Dictionary / Index B burstone: Meaning and Definition of Find definitions for: bur•stone Pronunciation: (bûr'stōn"), [key] — n. any of various siliceous rocks used for millstones. a millstone of such material. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bursting strength Burt Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language