of, containing, or like calcium carbonate; chalky: calcareous earth.

1670–80; variant of calcarious < Latin calcārius of lime; see calx, -arious

calcareously, adverb
calcareousness, noun
noncalcareous, adjective
subcalcareous, adjective
uncalcareous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
calcareous (kælˈkɛərɪəs)
of, containing, or resembling calcium carbonate; chalky
[C17: from Latin calcārius, from calx lime]

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

1670s, from L. calcarius "of lime," from calx (gen. calcis) "lime, limestone" (see chalk).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

calcareous cal·car·e·ous (kāl-kâr'ē-əs)
Composed of, containing, or characteristic of calcium carbonate, calcium, or limestone; chalky.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
calcareous   (kāl-kâr'ē-əs)  Pronunciation Key 
Composed of or containing calcium or calcium carbonate. Calcareous rocks contain as much as 50 percent calcium carbonate.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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