Breadcrumb Home > Dictionary > Index B boron: Meaning and Definition of Find definitions for: bo•ron Pronunciation: (bôr'on, bōr'-), [key] — n. Chem. a nonmetallic element occurring naturally only in combination, as in borax or boric acid, and obtained in either an amorphous or a crystalline form when reduced from its compounds. Symbol: B; at. wt.: 10.811; at. no.: 5. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: boron (Thesaurus) borohydride boron carbide ✖ Related Content Daily Word Quiz: donnybrook Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language