Usually means: Synthetic hormone used in contraceptives.
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We found 17 dictionaries that define the word norethindrone:

General (12 matching dictionaries)
  1. norethindrone: Merriam-Webster
  2. norethindrone: American Heritage Dictionary of the English Language
  3. norethindrone: Collins English Dictionary
  4. norethindrone: Vocabulary.com
  5. norethindrone: Wiktionary
  6. norethindrone: Infoplease Dictionary
  7. norethindrone: Dictionary.com
  8. Norethindrone: Wikipedia, the Free Encyclopedia
  9. norethindrone: Rhymezone
  10. norethindrone: FreeDictionary.org
  11. norethindrone: Mnemonic Dictionary
  12. norethindrone: TheFreeDictionary.com

Medicine (5 matching dictionaries)
  1. norethindrone: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Medical Dictionary (No longer online)
  4. online medical dictionary (No longer online)
  5. norethindrone: Medical dictionary

(Note: See norethindrones as well.)

Definitions from Wiktionary (Norethindrone)

noun:  (pharmacology) US form of norethisterone. [(pharmacology) A synthetic steroid hormone, 19-nor-17α-ethynyltestosterone (C₂₀H₂₆O₂), which has actions similar to those of progesterone and is used chiefly for contraception.]

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