one of the commonest minerals, calcium carbonate, CaCO 3 , found in a great variety of crystalline forms: a major constituent of limestone, marble, and chalk; calc-spar.
Historical Examples

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various
De Re Metallica Georgius Agricola
The Voyage of the Vega round Asia and Europe, Volume I and Volume II A.E. Nordenskieold
Birds and Nature, Vol. 12 No. 2 [July 1902] Various
Waiting for Daylight Henry Major Tomlinson
Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 Various
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 Various
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 Various
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 Various
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 Various

a colourless or white mineral (occasionally tinged with impurities), found in sedimentary and metamorphic rocks, in veins, in limestone, and in stalagmites and stalactites. It is used in the manufacture of cement, plaster, paint, glass, and fertilizer. Composition: calcium carbonate. Formula: CaCO3. Crystal structure: hexagonal (rhombohedral)
A usually white, clear, pale-yellow or blue orthorhombic mineral. Calcite occurs in many different forms and is the main component of chalk, limestone, and marble. It is a polymorph of aragonite. Chemical formula: CaCO3.


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    a polypeptide hormone that participates in the regulation of calcium levels in vertebrates by inhibiting loss of calcium from bone to the blood. noun a hormone secreted by the thyroid that inhibits the release of calcium from the skeleton and prevents a build-up of calcium in the blood Also called thyrocalcitonin Compare parathyroid hormone calcitonin […]

  • Calcitriol

    Biochemistry. a vitamin D compound, C 27 H 44 O 3 , occurring in humans as a hormone derived from cholesterol, that acts in the regulation and absorption of calcium. Pharmacology. a preparation of this compound, used in the treatment of osteoporosis and bone fracture.

  • Calcitrant


  • Calcium

    a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions. Symbol: Ca; atomic weight: 40.08; atomic number: 20; specific gravity: 1.55 at […]

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