the material of which the friable, vitreous layers in banded bituminous coal are composed.
Origin of vitrain
1915–20; < Latin vitr(um) glass + -ain, as in fusain
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a type of coal occurring as horizontal glassy bands of a nonsoiling friable material
Word Origin for vitrain
C20: from Latin vitrum glass + -ain, as in fusain
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