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durain

[doo r-eyn, dyoo r-]
noun Mineralogy.
  1. the coal forming the dull layers in banded bituminous coal.
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Compare clarain, vitrain.

Origin of durain

1915–20; < Latin dūr(us) hard + -ain, from fusain, by analysis as a suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018