/ Dictionary / Index E equimolecular: Meaning and Definition of Find definitions for: e•qui•mo•lec•u•lar Pronunciation: (ē"kwu-mu-lek'yu-lur, ek'wu-), [key] — adj. Physics, Chem. containing equal numbers of molecules. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. equilibrium valve equine Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language