- 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. 2018
- a type of coal occurring as horizontal glassy bands of a nonsoiling friable material
C20: from Latin vitrum glass + -ain, as in fusain