Calcareous meaning

kăl-kâr'ē-əs
Composed of, containing, or characteristic of calcium carbonate, calcium, or limestone; chalky.
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Of, like, or containing calcium carbonate, calcium, or lime.
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Composed of or containing calcium or calcium carbonate. Calcareous rocks contain as much as 50 percent calcium carbonate.
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Resembling or containing calcium carbonate or limestone; chalky.
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Origin of calcareous

From Latin calcārius (“of or pertaining to lime”), derived from calx (“lime”). Similar to calcium.