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superoxalate
superoxalate n. 
/ˌsjuːpərˈɒksəleɪt/,
Brit. /ˌsuːpərˈɒksəleɪt/
, /ˌsuːpərˈɒksəleɪt//ˌsjuːpərˈɒksəleɪt/U.S. /ˌsupərˈɑksəˌleɪt/
/ˌsupərˈɑksəˌleɪt/ΚΠ
1798 Philos. Trans. (Royal Soc.) 88 44 Superoxalate of potash.
1900 Pharmaceut. Jrnl. 2 Sept. 234/1 (heading) Potassium superoxalate.
2000 M. C. Usselman in F. L. Holmes & T. H. Levere Instruments & Exper. Hist. Chem. x. 262 The acid content of the new salt was found to be twice that of the superoxalate and four times that of the oxalate of potash.
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