lime stone

limestone

[lahym-stohn]
noun
a sedimentary rock consisting predominantly of calcium carbonate, varieties of which are formed from the skeletons of marine microorganisms and coral: used as a building stone and in the manufacture of lime.
Compare marble.


Origin:
1515–25; lime1 + stone

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World English Dictionary
limestone (ˈlaɪmˌstəʊn)
 
n
a sedimentary rock consisting mainly of calcium carbonate, deposited as the calcareous remains of marine animals or chemically precipitated from the sea: used as a building stone and in the manufacture of cement, lime, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

limestone
1520s, from lime (1) + stone.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
limestone   (līm'stōn')  Pronunciation Key 
A sedimentary rock consisting primarily of calcium carbonate, often in the form of the minerals calcite or aragonite, and sometimes with magnesium carbonate in the form of dolomite. Minor amounts of silica, feldspar, pyrite, and clay may also be present. Limestone can occur in many colors but is usually white, gray, or black. It forms either through the accumulation and compaction of fossil shells or other calcium-carbonate based marine organisms, such as coral, or through the chemical precipitation of calcium carbonate out of sea water.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

limestone definition


Sedimentary rock formed primarily of calcium carbonate, often the skeletons of small marine organisms.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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