from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A yellow hygroscopic powder, C12H12As2N2O2·2HCl·2H2O, formerly used to treat syphilis, yaws, and other spirochetal infections.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A phenolic amine derivative of arsenic that was used to treat syphilis (under the trade name of Salvarsan).
ars(enic) + phen(yl) + amine.(American Heritage® Dictionary of the English Language, Fourth Edition)
From arsenic + phen- + amine. (Wiktionary)