fu·​sain | \ ˈfyüˌzān\
plural -s

Definition of fusain

: a dull constituent closely resembling charcoal that is present in banded bituminous coals and causes much of the dust in coal mines — compare clarain, durain, vitrain

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History and Etymology for fusain

French, spindle tree, charcoal made from spindle-tree wood, fusain, from (assumed) Vulgar Latin fusagin-, fusago, from Latin fusus spindle; from the fact that the wood of the tree was used for spindles

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