Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Coal.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an inferior dark diamond used in industry for drilling and polishing
Etymologies
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Examples
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alexz commented on the word black diamond
Black diamond is a trail rating for an expert trail. This denotes that serious injury can occur in an accident.
January 12, 2013