Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A brilliant black band in bituminous coal, characterized by cubic cleavage, a conchoidal fracture, and a vitreous luster.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[Latin vitreus, made of glass, glassy; see vitreous + (fus)ain.]
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