say it: tam-AHK-suh-fuhn
tamoxifen is a noun meaning "an antagonist for estrogen that is used in the treatment of breast cancer". It carries one recorded sense.
an antagonist for estrogen that is used in the treatment of breast cancer
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for tamoxifen come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.