fusain
noun
fu·sain
ˈfyüˌzān
plural -s
: 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
Word History
Etymology
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