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.


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  • 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 […]

  • Calcium-antagonist

    noun another name for calcium channel blocker

  • Calcium-arsenate

    a white, slightly water-soluble, poisonous powder, Ca 3 (AsO 4) 2 , used as an insecticide and as a germicide.

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