alkargenn.
/alˈkɑːdʒ(ə)n/, U.S. /ˌælˈkɑrdʒ(ə)n/ Chemistry. Now historical and rare.
Cacodylic acid, (CH3)2AsO2H.
ΚΠ
1838 Brit. Ann. & Epitome Progress Sci. 1839 360 Alkargen, obtained by Bunsen from the action of oxygen on alkarsin.
1843 J. S. Mill Syst. Logic III. ix. §1. i. 482 The substance called alkargen, discovered by Bunsen,..has not the slightest injurious action upon the organism.
1866 H. Draper Text-bk. Chem. lxxvi. 425 Kakodylic Acid—Alcargen (KdO3)—may be made by the action of oxide of mercury upon oxide of kakodyle.
2001 Organometallics 20 1492/1 Cacodylic acid (originally Alkargen) which Bunsen wrote as KdO3 and which in its modern formula is (CH3)2As(O)OH.
This entry has been updated (OED Third Edition, September 2009; most recently modified version published online December 2021).
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