/ Dictionary / Index M molecular: Meaning and Definition of Find definitions for: mo•lec•u•lar Pronunciation: (mu-lek'yu-lur), [key] — adj. of or pertaining to or caused by molecules: molecular structure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: molecular (Thesaurus) mole cricket molecular astronomy Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language