English dictionary
limestone
/'l/aI/m,st/oU/n/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
Source: WordNet 3.0
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A rock consisting chiefly of calcium carbonate or carbonate of lime. It sometimes contains also magnesium carbonate, and is then called <i>magnesian</i> or <i>dolomitic limestone</i>. Crystalline limestone is called <i>marble</i>.
Source: webster1913