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Webster 1913 Edition
Cacodylic
Cacˊo-dyl′ic
,Adj.
 (Chem.) 
Of, pertaining to, or derived from, cacodyl. 
Cacodylic acid
, a white, crystalline, deliquescent substance, 
 (CH3)2AsO.OH
, obtained by the oxidation of cacodyl, and having the properties of an exceedingly stable acid; – also called alkargen
.