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tamoxifen Line breaks: tam|oxi|fen
Pronunciation: /təˈmɒksɪfɛn/

Definition of tamoxifen in English:


[mass noun] Medicine
A synthetic drug used to treat breast cancer and infertility in women. It acts as an oestrogen antagonist.
Example sentences
  • The risk is small compared to the benefits of using tamoxifen to treat breast cancer.
  • The question of how long patients should continue taking the drug is important because tamoxifen is not problem free.
  • Patients managed as outpatients (such as those treated with tamoxifen only) were likely to be missed.


1970s: an arbitrary formation based on trans-, amine, oxy-2, phenol, elements of the drug's chemical name.

Definition of tamoxifen in:

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