'Cacodyl' definitions:

Definition of 'cacodyl'

(from WordNet)
noun
A poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air [syn: cacodyl, tetramethyldiarsine]
noun
The univalent group derived from arsine [syn: cacodyl, cacodyl group, cacodyl radical, arsenic group]

Definition of 'Cacodyl'

From: GCIDE
  • 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]