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Related to vitrain: durain
A brilliant black band in bituminous coal, characterized by cubic cleavage, a conchoidal fracture, and a vitreous luster.
[Latin vitreus, made of glass, glassy; see vitreous + (fus)ain.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) a type of coal occurring as horizontal glassy bands of a nonsoiling friable material
[C20: from Latin vitrum glass + -ain, as in fusain]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014