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[tuh-mok-suh-fuh n, ‐fen] /təˈmɒk sə fən, ‐ˌfɛn/
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.
Origin of tamoxifen
1970-75; perhaps t(rans)- + am(ino)- + oxy-2 + phen(yl), with respelling of y and ph Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tamoxifen


a drug that antagonizes the action of oestrogen and is used to treat breast cancer and some types of infertility in women
Word Origin
C20: altered from t(rans-) + am(ine) + oxy-² + phen(ol)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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tamoxifen in Science
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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