Definify.com
Webster 1913 Edition
Cacodyl
Cac′o-dyl
,Noun.
 [Gr. [GREEK][GREEK][GREEK][GREEK][GREEK][GREEK][GREEK] ill-smelling (
κακόσ 
bad + [GREEK][GREEK][GREEK][GREEK][GREEK] 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
.]