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1. The univalent arsenic group (CH3)2As.
2. A poisonous oil, As2(CH3)4, with an obnoxious garlicky odor.

[Greek kakōdēs, bad-smelling (kakos, bad; see kakka- in Indo-European roots + -ōdēs, -smelling, from ozein, ōd-, to smell) + -yl.]

cac′o·dyl′ic adj.


(Elements & Compounds) an oily poisonous liquid with a strong garlic smell; tetramethyldiarsine. Formula: [(CH3)2As]2
[C19: from Greek kakōdēs evil-smelling (from kakos caco- + ozein to smell) + -yl]
cacodylic adj


(ˈkæk ə dɪl)
a foul-smelling, poisonous oil, C4H12As2, that undergoes spontaneous combustion in dry air.
[1840–50; < Greek]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.cacodyl - a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air
organic compound - any compound of carbon and another element or a radical
2.cacodyl - the univalent group derived from arsine
chemical group, radical, group - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
References in classic literature ?
It is cyanide of cacodyl, and I have carried that small flask of it about with me for months.
Multiple random samples taken from each piece of cartilage were fixed with 2.5 % (wt/ vol) sodium cacodyl buffered glutaraldehyde, pH 7.2 at 4 [degrees]C for 2 h.
He is quoted as asserting that the Government possesses knowledge of a new gas, believed by him to be cacodyl isocyanide, which is so overwhelmingly deadly that the Chemical Warfare Service of the Army has attempted to suppress discussion about it.