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levonorgestrel Line breaks: levo|nor¦ges¦trel
Pronunciation: /ˌliːvəʊnɔːˈdʒɛstr(ə)l/

Definition of levonorgestrel in English:


[mass noun] Biochemistry
A synthetic steroid hormone which has a similar effect to progesterone and is used in some contraceptive pills.
Example sentences
  • We have Progestasert (a progesterone IUD), which is still available as well as the newer Mirena, which relies on the hormone levonorgestrel, a synthetic progesterone.
  • Plan B uses a form of the synthetic hormone progestin, called levonorgestrel, to block ovulation and fertilization of the egg in a process similar to what happens with use of traditional birth control pills.
  • It consists of the hormone levonorgestrel, a common ingredient in birth control pills.


1970s: from levo- (it being a laevorotatory isomer) + norgestrel, a synthetic steroid hormone.

Definition of levonorgestrel in:
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