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vitrain

American

[vi-trayn] / ˈvɪ treɪn /

noun

the material of which the friable, vitreous layers in banded bituminous coal are composed.

vitrain British

/ ˈvɪtreɪn /

noun

a type of coal occurring as horizontal glassy bands of a nonsoiling friable material

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of vitrain

1915–20; < Latin vitr ( um ) glass + -ain, as in fusain

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023