alkarsin
/alˈkɑːsɪn/(also alcarsin, alkarsine) Chemistry. Now historical
noun
Cacodyl, As(CH3)2; an impure form of this.
Origin
Mid 19th century. From German Alkarsin from Alk- (in Alkali) + Ars- (in Arsenik) + -in, with reference to its preparation.