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clarain

[klair-eyn]
noun
  1. the coal forming the bright layers in banded bituminous coal.
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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. 2018