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durain

[doo r-eyn, dyoo r-] /ˈdʊər eɪn, ˈdyʊər-/
noun, Mineralogy
1.
the coal forming the dull layers in banded bituminous coal.
Compare clarain, vitrain.
Origin
1915-1920
1915-20; < Latin dūr(us) hard + -ain, from fusain, by analysis as a suffix
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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