English
Alternative forms
Noun
graystone (plural graystones)
- (uncountable) A type of gray, volcanic rock, typically containing feldspar and iron
- A building made of any type of gray stone, such as limestone
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2009, January 4, Letters: Mr. Obama’s Neighborhood:- Founded almost 50 years ago, it's an imposing graystone structure (formerly a park district office).
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