[tuh-mok-suh-fuhn, ‐fen]
noun Pharmacology.
an antineoplastic drug, C 26 H 29 NO, that blocks the estrogen receptors on cancer cells, used in the treatment of breast cancer.

1970–75; perhaps t(rans)- + am(ino)- + oxy-2 + phen(yl), with respelling of y and ph

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World English Dictionary
tamoxifen (təˈmɒksɪfɛn)
a drug that antagonizes the action of oestrogen and is used to treat breast cancer and some types of infertility in women
[C20: altered from t(rans-) + am(ine) + oxy-² + phen(ol)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
tamoxifen   (tə-mŏk'sə-fěn)  Pronunciation Key 
An estrogen antagonist drug used to treat advanced breast cancer in women whose tumors are estrogen-dependent and to prevent breast cancer in some women who are at high risk.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Tamoxifen is designed to prevent estrogen receptor-positive tumors.
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