/ Dictionary / Index B borosilicate: Meaning and Definition of Find definitions for: bo•ro•sil•i•cate Pronunciation: (bôr"u-sil'i-kit, -kāt", bōr"-), [key] — n. Chem. a salt of boric and silicic acids. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: borosilicate (Thesaurus) boron oxide borosilicate glass Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language