/ (ˌniːəʊɑːsˈfɛnəˌmiːn, -fɪˈnæmɪn) /
a derivative of arsenic formerly used in treating syphilis
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
Examples from the Web for neoarsphenamine
He reports, however, that it was necessary in eleven out of one hundred cases to change from Mon-Arsone to neoarsphenamine.