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blue stone

 - 2 dictionary results

blue⋅stone

[bloo-stohn]
–noun
a bluish, argillaceous sandstone used for building purposes, flagging, etc.

Origin:
1645–55; blue + stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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blue stone

noun
hydrated blue crystalline form of copper sulfate [syn: blue vitriol
WordNet® 3.0, © 2006 by Princeton University.
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