English > atomic number 20: 1 sense > noun 1, substance| Meaning | 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. |
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| Synonyms | calcium, Ca |
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| Narrower | calcium ion, factor IV | ion of calcium |
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| Broader | 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. |
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| Substance of | calcium oxide, quicklime, lime, calx, calcined lime, fluxing lime, unslaked lime, burnt lime | A white crystalline oxide used in the production of calcium hydroxide |
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| fluorite, fluorspar, fluor | A soft mineral (calcium fluoride) that is fluorescent in ultraviolet light |
| gypsum | A common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters / plasters (especially plaster of Paris) |
| limestone | A sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals |
| Spanish | calcio, número atómico 20 |
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| Catalan | calci, número atòmic 20 |
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