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chlorocyanic acid
chlorocyanic acid n. 
/ˌklɒrə(ʊ)sʌɪanɪk ˈasɪd/,
Brit. /ˌklɔːrə(ʊ)sʌɪanɪk ˈasɪd/
, /ˌklɔːrə(ʊ)sʌɪanɪk ˈasɪd//ˌklɒrə(ʊ)sʌɪanɪk ˈasɪd/U.S. /ˈˌklɔroʊsaɪˌænɪk ˈæsəd/
early name of cyanogen chloride, CNCl./ˈˌklɔroʊsaɪˌænɪk ˈæsəd/ΚΠ
1819 J. G. Children Ess. Chem. Anal. 323 Chlorocyanic acid was first observed by Berthollet, and called by him ‘oxyprussic acid.’
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