clarain

[ klair-eyn ]
/ ˈklɛər eɪn /

noun

the coal forming the bright layers in banded bituminous coal.

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What does “clement” mean?
Compare durain, vitrain.

Origin of clarain

1915–20; <Latin clār(us) clear, bright + French -ain, as in durain
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020