Cacodyl \Cac"o*dyl\, n. [Gr. ??????? ill-smelling (kako`s bad +
????? to smell) + -yl.] (Chem.)
Alkarsin; a colorless, poisonous, arsenical liquid,
{As2(CH3)4}, spontaneously inflammable and possessing an
intensely disagreeable odor. It is the type of a series of
compounds analogous to the nitrogen compounds called
hydrazines. [Written also {cacodyle}, and {kakodyl}.]
[1913 Webster]