Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A weak, unstable acid, H2CO3, present in solutions of carbon dioxide in water.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun a weak unstable acid, H2CO3, known only in solution, and as carbonate salts; it is present in carbonated drinks, and sparkling wine, but decomposes to form carbon dioxide and water

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a weak acid known only in solution; formed when carbon dioxide combines with water

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