Definition of calcium Calcium
/kæˈlsiʌm/ - [katlseeum] - cal•ci•um
We found 9 definitions of calcium from 8 different sources.
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What does calcium mean?
WordNet
NounPlural: calciums |
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| calcium - a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals | ||
| Ca, atomic number 20 | ||
| metallic element, metal any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. | ||
| burnt lime, calcined lime, calcium oxide, calx, fluxing lime, quicklime, unslaked lime, lime a white crystalline oxide used in the production of calcium hydroxide | ||
| limestone a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals | ||
| gypsum a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) | ||
| fluor, fluorite, fluorspar a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine | ||
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Wiktionary 
Webster DictionaryWebster's Unabridged Dictionary 📘
- calcium (n.)
An elementary substance; a metal which combined with oxygen forms lime. It is of a pale yellow color, tenacious, and malleable. It is a member of the alkaline earth group of elements. Atomic weight 40. Symbol Ca.
OmegaWiki DictionaryOmegaWiki Dictionary Ω
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calcium
A malleable silvery-white metallic element of the alkaline earth group with symbol Ca and atomic number 20; the fifth most abundant element in the earth crust, occurring especially as forms of calcium carbonate. It is an essential constituent of bones and teeth and is used as a deoxidizer in steel.\n(Source: CED)
Chambers DictionaryChamber's 20th Century Dictionary 📕
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calcium
kal′si-um, n. the metal present in chalk, stucco, and other compounds of lime.—adjs. Cal′cic, containing calcium; Cal′cific, calcifying or calcified.—v.i. Cal′cificā′tion, the process of calcifying, a changing into lime.—adjs. Cal′ciform, like chalk, pebbly; Calcif′ugous, avoiding limestone.—v.t. and v.i. Cal′cify, to make calcic: to turn into bony tissue.—adjs. Calcig′enous, forming lime; Calcig′erous, containing lime.—n. Cal′cimine, a white or tinted wash for ceilings, walls, &c., consisting of whiting, with glue, &c.—v.t. to wash with such.—adj. Cal′cinable, capable of being calcined.—n. Calcinā′tion.—v.t. Cal′cine, or Calcine′, to reduce to a calx or chalky powder by the action of heat, to burn to ashes.—v.i. to become a calx or powder by heat.—ns. Cal′cite, native calcium carbonate, or carbonate of lime—also called Calcā′reous spar and Calc′spar; Calc′-sin′ter, Calc′-tuff, Tra′vertin, a porous deposit from springs or rivers which in flowing through limestone rocks have become charged with calcium carbonate. [Formed from L. calx, chalk.]
Foolish DictionaryThe Foolish Dictionary 🤡
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calcium
An earthly light that brightens even the stars.
Wikipedia 
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Calcium is a chemical element. Its symbol on the periodic table (a list of all the elements) is Ca. Its atomic number is 20. (The atomic number says where Calcium sits in the periodic table.)
Calcium is a soft white-gray substance. It is the 5th most common element on the earth.
Calcium in living things.
Calcium is very important for all organisms. To stay healthy it is important to eat calcium every day. Without enough calcium bones can become weak. This is called osteoporosis.
Calcium in cells.
It is important to know how cells work. Many cells have "calcium channels" on their surface. These are openings where calcium can enter the cell. The cell is told to act and it opens the channels. Once in the cell calcium activates many proteins to do specific things. For example, when it goes into muscle cells, it makes them "contract" (shorten so the muscle pulls.) When it goes into nerve cells, it triggers electrical impulses that send a messages. When it goes into white blood cells it makes them fight germs.
Calcium is important to cells and too much calcium can be bad. If a cell gets more calcium than it needs it can die. This is why the amount of calcium in cells is highly regulated. Conversely, not enough calcium is bad. Cells must have the right amount to function properly.
Sometimes cells are unhealthy and need to die in for the body to replace them with new, healthy cells. This keeps the whole organism healthy. Cells know when they should die and can trigger reactions to en
Part of speech
🔤- calcium, noun, singular of calciums.
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