ar·sa·nil·ic acid noun \ˌärs-ən-ˌil-ik-\
: any of the poisonous crystalline isomeric acids NH2C6H4AsO(OH)2; especially : the para isomer analogous to sulfanilic acid used in making organic arsenical drugs
Seen & Heard
What made you want to look up arsanilic acid? Please tell us where you read or heard it (including the quote, if possible).