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sesquioctava
sesquioctava n.
Brit. 
/ˌsɛskwɪɒkˈteɪvə/
, /ˌsɛskwɪɒkˈteɪvə/U.S. /ˌsɛskwiˌɑkˈteɪvə/
/ˌsɛskwiˌɑkˈteɪvə/ΚΠ
1825 T. Thomson Attempt to Establish First Princ. Chem. II. App. 515 Sesquicarbonate of ammonia.
1883 J. T. Taylor Hardwich's Man. Photogr. Chem. (ed. 9) 38 When first formed it has nearly the composition of a Sesquicarbonate, but by exposure to the air neutral Carbonate of Ammonia escapes, and a white powder is left, which is a Bicarbonate.
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