/ Dictionary / Index I isotopy: Meaning and Definition of Find definitions for: i•sot•o•py Pronunciation: (ī-sot'u-pē, ī'su-tō"pē), [key] — n. Chem. the quality or condition of being isotopic; isotopic character. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isotopic spin isotretinoin Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language