n.
Pronunciation: ärs- ' fe-n ə - ˌ m ē n, -m ə n
Function: noun
Etymology: International Scientific Vocabulary ars enic + phenamine
Date: 1917
: a light-yellow toxic hygroscopic powder C 12 Cl 2 H 14 As 2 N 2 O 2 ·2H 2 O formerly used in the treatment especially of syphilis and yaws