• synonyms


  1. containing the cacodyl group.
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  1. an oily, slightly water-soluble, poisonous liquid compound composed of two cacodyl groups, (CH3)2As−As(CH3)2, that has a vile, garliclike odor and that undergoes spontaneous combustion in dry air.
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Origin of cacodyl

1840–50; < Greek kakṓd(ēs) ill-smelling (kak(o)- caco- + -ōd- smell + -ēs adj. suffix) + -yl
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for cacodyl

Historical Examples

  • The dimethyl arsine (or cacodyl) compounds have been most studied.

    Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6


  • Simultaneously with his work on cacodyl, he was studying the composition of the gases given off from blast furnaces.

British Dictionary definitions for cacodyl


  1. an oily poisonous liquid with a strong garlic smell; tetramethyldiarsine. Formula: [(CH 3) 2 As] 2
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Derived Formscacodylic (ˌkækəˈdɪlɪk), adjective

Word Origin

C19: from Greek kakōdēs evil-smelling (from kakos caco- + ozein to smell) + -yl
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012