/ Dictionary / Index U ulexite: Meaning and Definition of Find definitions for: u•lex•ite Pronunciation: (y-lek'sīt), [key] — n. a mineral, hydrous sodium and calcium borate, NaCaBO&multiplydot;8HO, occurring in arid regions in the form of white acicular crystals: a major source of borax. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -ulent Ulfilas Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language