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chrysophan
chrysophan n.
Brit. 
/ˈkrɪsəfan/
, /ˈkrɪsəfan/U.S. /ˈkrɪsəˌfæn/
(also ˈchrysophane) [Greek *ϕαν-, ϕαίνειν to bring into sight] Chemistry a name given to an orange-red bitter substance contained in the alcoholic extract of rhubarb (Watts); also to chrysophanic acid./ˈkrɪsəˌfæn/ΚΠ
1844 F. Alger Phillips's Elem. Treat. Mineral. (ed. 5) 645 Chrysophane.
1869–72 H. Watts Dict. Chem. VI. 460 Chrysophane..resolvable by acids into chrysophanic acid and sugar.
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