/ Dictionary / Index N norethindrone: Meaning and Definition of Find definitions for: nor•eth•in•drone Pronunciation: (nôr-eth'in-drōn"), [key] — n. Pharm. an orally active progestin, CHO, used as a progesterone, esp. as an oral contraceptive in combination with an estrogen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: norethindrone (Thesaurus) norepinephrine norethynodrel 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