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

  • noun A common sedimentary rock consisting mostly of calcium carbonate, CaCO3, used as a building stone and in the manufacture of lime, carbon dioxide, and cement.

from The Century Dictionary.

  • noun A limestone in the New York series of formations, originally called the Scutella and Upper Pentamerus limestones of the Lower Helderberg group of strata. It belongs to the lowest or Helderbergian division of the Lower Devonian, lying near the top, beneath the Port Ewen beds and above the New Scotland limestone. It abounds in fossil remains, and from its purity is highly esteemed both as a construction stone and as a flux in smelting.
  • noun A division of the Lower Silurian of New York State and the adjoining regions, originally termed by Eaton the “Calciferous sandrock.” It is regarded as the lowest member of the Lower Silurian, resting on and graduating by easy changes from the Potsdam sandstone beneath. The rock in northern New York and the Lake Champlain basin is largely a limestone, at times magnesian, and carries a profuse and highly interesting marine fauna. In the Mohawk valley the beds are almost devoid of organic remains, are highly dolomitic, and have been locally designated as the Little Falls dolomite.
  • noun Rock consisting wholly or in large part of calcareous material or carbonate of lime.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A rock consisting chiefly of calcium carbonate or carbonate of lime. It sometimes contains also magnesium carbonate, and is then called magnesian or dolomitic limestone. Crystalline limestone is called marble.

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

  • noun mineralogy An abundant rock of marine and fresh-water sediments; primarily composed of calcite (CaCO₃); it occurs in a variety of forms, both crystalline and amorphous.
  • adjective Made of or with limestone.

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

  • noun a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals


Sorry, no etymologies found.



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  • Not to be taken for granite.

    June 13, 2008

  • That's a good one!

    The definition puzzles me though. How can the remains of marine animals deposit...anything?

    June 13, 2008

  • You know, that's a good point. Or maybe the rest of the marine animal remains decomposed, leaving the calcium deposits?

    June 14, 2008