Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • noun Dimethyl arsine, As(CH3)2, a metalloid radical, a compound of arsenic, hydrogen, and carbon.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry The dimethylarsine radical (CH3)2As-
  • noun chemistry tetramethyldiarsine formally derived from two of these radicals; an evil-smelling liquid that spontaneously combusts in air

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air
  • noun the univalent group derived from arsine

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek κακώδης (kakōdēs, "evil smelling")

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