BLUE STONE

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 Dictionary entry overview: What does blue stone mean? 

• BLUE STONE (noun)
  The noun BLUE STONE has 1 sense:

1. hydrated blue crystalline form of copper sulfate

  Familiarity information: BLUE STONE used as a noun is very rare.

 Dictionary entry details 

• BLUE STONE (noun)

Sense 1

Meaning:

Hydrated blue crystalline form of copper sulfate

Classified under:

Nouns denoting substances

Synonyms:

blue copperas; blue stone; blue vitriol; chalcanthite

Hypernyms ("blue stone" is a kind of...):

copper sulfate; copper sulphate; cupric sulfate; cupric sulphate (a copper salt made by the action of sulfuric acid on copper oxide)

 Context examples 

You had heard, Ryder, of this blue stone of the Countess of Morcar’s?

(The Adventures of Sherlock Holmes, by Sir Arthur Conan Doyle)

He held out his hand and displayed upon the centre of the palm a brilliantly scintillating blue stone, rather smaller than a bean in size, but of such purity and radiance that it twinkled like an electric point in the dark hollow of his hand.

(The Adventures of Sherlock Holmes, by Sir Arthur Conan Doyle)