/ Dictionary / Index P polar molecule: Meaning and Definition of Find definitions for: po'lar mol'ecule Pronunciation: [key] a molecule in which the centroid of the positive charges is different from the centroid of the negative charges. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polar lights polar nucleus Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language