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ferrocyanhydric acid
ferrocyanhydric acid n. 
/ˌfɛrə(ʊ)sʌɪanhʌɪdrɪk ˈasɪd/,
Brit. /ˌfɛrə(ʊ)sʌɪənhʌɪdrɪk ˈasɪd/
, /ˌfɛrə(ʊ)sʌɪənhʌɪdrɪk ˈasɪd//ˌfɛrə(ʊ)sʌɪanhʌɪdrɪk ˈasɪd/U.S. /ˌfɛroʊˌsaɪənˌhaɪdrɪk ˈæsəd/
now rare = ferrocyanic acid n./ˌfɛroʊˌsaɪənˌhaɪdrɪk ˈæsəd/ΚΠ
1843 T. Thomson Chem. Animal Bodies ii. 30 Ferrocyanhydric acid.
1854 N.Y. Jrnl. Pharmacy 3 190 When a cold saturated solution of ferrocyanate of potass is mixed with its own volume of fuming muriatic acid..a snow white precipitate of pure ferrocyanhydric acid is thrown down.
1994 Talanta 41 1435/2 The starting hexacyanoferrate compound is either an alkaline-metal salt or ferrocyanhydric acid.
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