/ Dictionary / Index L Lexan: Meaning and Definition of Find definitions for: Lex•an Pronunciation: (lek'san), [key] — Chem., Trademark. Chem.,Trademark. a brand of hard, practically unbreakable polycarbonate resin, used for shatterproof windows and the like. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lex Lexell Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language