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The Collaborative International Dictionary
Flucan

Flucan \Flu"can\, n. (Mining) Soft clayey matter in the vein, or surrounding it. [Written also flookan, flukan, and fluccan.]

Wiktionary
flucan

alt. (context mining English) Soft clayey matter in the vein, or surrounding it. n. (context mining English) Soft clayey matter in the vein, or surrounding it.