ta ‧ mox ‧ i ‧ fen /təˈmɒksəfen, təˈmɒksɪfen $ -ˈmɑːk-/ BrE AmE noun [uncountable]
[ Date: 1900-2000 ; Origin: trans- + amine ( ⇨ ↑ amino acid ) + oxy- (from oxygen ) + phenol type of chemical compound (19-21 centuries) ]
a drug that is used to treat breast ↑ cancer