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durain

American  
[door-eyn, dyoor-] / ˈdʊər eɪn, ˈdjʊər- /

noun

Mineralogy.
  1. the coal forming the dull layers in banded bituminous coal.


Etymology

Origin of durain

1915–20; < Latin dūr ( us ) hard + -ain, from fusain, by analysis as a suffix

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