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leuco-cyanide
leuco-cyanide n. 
/ˌlukoʊˈsaɪəˌnaɪd/
Brit. /ˌl(j)uːkə(ʊ)ˈsʌɪənʌɪd/
, /ˌl(j)uːkə(ʊ)ˈsʌɪənʌɪd/U.S. /ˌlukəˈsaɪəˌnaɪd/
, /ˌlukəˈsaɪəˌnaɪd//ˌlukoʊˈsaɪəˌnaɪd/ΚΠ
1931 Trans. Faraday Soc. 27 571 The pure alcoholic leuco cyanide solution is very suitable for a laboratory method [of measuring ultra-violet light].
1965 J. Kosar Light-sensitive Syst. viii. 370 Aside from the photographic applications, light-sensitive leucocyanides are useful for detecting, measuring, and recording short wave ultraviolet light.
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