/ Dictionary / Index N Nomex: Meaning and Definition of Find definitions for: No•mex Pronunciation: (nō'meks), [key] — Trademark. Trademark. a brand of lightweight, heat-resistant aramid fiber used in clothing, esp. for firefighters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nomenklatura nominal Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language