noun, often attributive \ˈkal-sē-əm\

: a substance that is found in most plants and animals and that is especially important in people for strong healthy bones

Full Definition of CALCIUM

:  a silver-white divalent metallic element of the alkaline-earth group occurring only in combination — see element table

Examples of CALCIUM

  1. Her doctor said she should eat more foods that are high in calcium, such as milk and cheese.

Origin of CALCIUM

New Latin, from Latin calc-, calx lime
First Known Use: 1808

Other Chemical Engineering Terms

alkali, cation, decant, hygroscopic, isotope, oxidize, slurry, solute, viscous


noun , often attrib \ˈkal-sē-əm\   (Medical Dictionary)

Medical Definition of CALCIUM

: a silver-white bivalent metallic element that is an alkaline earth metal, occurs only in combination, and is an essential constituent of most plants and animals—symbol Ca; see element table


noun    (Concise Encyclopedia)

Chemical element, one of the alkaline earth metals, chemical symbol Ca, atomic number 20. The most abundant metallic element in the human body, it is an essential part of bones and teeth and has many physiological functions (see calcium deficiency; tooth). It is the fifth most abundant element in Earth's crust but does not occur naturally in the free state. In its compounds calcium has valence 2. It occurs in limestone, chalk, marble, dolomite, eggshells, pearls, coral, and many marine shells as calcium carbonate, or calcite; in apatite as calcium phosphate; in gypsum as calcium sulfate; and in many other minerals. It is used as an alloying agent and in other metallurgical applications; its alloy with lead is used in cable sheathing and grids for batteries. Calcite is used as a lime source, a filler, a neutralizer, and an extender; in pure form it is used in baking powder and as an antacid and calcium supplement. Calcium oxide (lime) and its product after water addition, calcium hydroxide (slaked lime), are important industrially. Other significant compounds are calcium chloride (a drying agent), calcium hypochlorite (a bleach), calcium sulfate (gypsum and plaster of paris), and calcium phosphate (a plant food and stabilizer for plastics).


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