from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Composed of, containing, or characteristic of calcium carbonate, calcium, or limestone; chalky.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Resembling or containing calcium carbonate or limestone; chalky.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Partaking of the nature of calcite or calcium carbonate; consisting of, or containing, calcium carbonate or carbonate of lime.

from The Century Dictionary and Cyclopedia

  • Partaking of the nature of lime; having the qualities of lime; containing lime; chalky: as, calcareous earth or stone.

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

  • adj. composed of or containing or resembling calcium carbonate or calcite or chalk


From Latin calcārius, from calx, calc-, lime; see calx.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin calcārius ("of or pertaining to lime"), derived from calx ("lime"). Similar to calcium. (Wiktionary)



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  • "'And all founded upon what? Upon the skeletons of other coral-polyps, the calcareous external skeletons of other coral-polyps, in quantities that run far beyond conception, that is what. For I do assure you, Jack, that everything here, apart from these trifling adventitious vegetables'—waving toward the palms—'is coral, living or dead, coral sand or solid coralline accumulation. There is no subjacent rock at all. ... The force of these waves is very great: the animalculum is miserably frail.'"
    --Patrick O'Brian, The Far Side of the World, 317

    February 23, 2008