# calcium
## English
### Etymology

Coined by British chemist Humphry Davy in 1808, from Latin calx (“lime, limestone”) because it occurs in limestone.

### Pronunciation

* (US) IPA: /ˈkælsi.əm/
* (Philippines) IPA: /ˈkæl.ʃum/
* Audio (US):(file)

### Noun

calcium (countable and uncountable, plural calciums)
* The chemical element (Symbol Ca), with an atomic number 20. It is a soft, silvery-white alkaline earth metal which occurs naturally as carbonate in limestone and as silicate in many rocks.
** 2013 September-October, Katie L. Burke, “In the News”, in American Scientist:Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: […] . The evolutionary precursor of photosynthesis is still under debate, and a new study sheds light. The critical component of the photosynthetic system is the “water-oxidizing complex”, made up of manganese atoms and a calcium atom.
* (countable) An atom of this element.

#### Derived terms

* bismuth strontium calcium copper oxide
* calcaemia
* calc-, calci-
* calcein
* calcemia
* calcic
* calcio-
* calcium-40
* calcium-42
* calcium-43
* calcium-44
* calcium-45
* calcium-46
* calcium-48
* calcium acetate
* calcium arsenate
* calcium benzoate
* calcium bilirubinate
* calcium cannon
* calcium carbide
* calcium carbonate
* calcium channel blocker
* calcium chloride
* calcium chromate
* calcium copper tetrasilicate
* calcium cyanamide
* calcium diglutamate
* calcium dihydrogen phosphate
* calcium dioxide
* calcium disodium EDTA
* calcium ferrocyanide
* calcium fluoride
* calcium formate
* calcium fumarate
* calcium gluconate
* calcium guanylate
* calcium hydride
* calcium hydroxide
* calcium hypochlorite
* calcium inosinate
* calcium lactate
* calcium light
* calciumlike
* calcium magnesium carbonate
* calcium magnesium silicate
* calcium malate
* calcium-montmorillonite
* calcium montmorillonite
* calcium nitrate
* calcium nitride
* calcium oxalate
* calcium oxide
* calcium permanganate
* calcium peroxide
* calcium phosphate
* calcium phosphide
* calcium platinate
* calcium polyphosphate
* calcium propionate
* calcium pyrophosphate dihydrate deposition disease
* calcium silicate
* calcium sodium polyphosphate
* calcium sorbate
* calcium sulfate, calcium sulphate
* calcium sulfide, calcium sulphide
* calcium sulphite
* calcium tartrate
* calcium tungstate
* calcrete
* caldesmon
* calfluxin
* calprotectin
* calretinin
* calsulfhydryl
* cinacalcet
* decacalcium
* dicalcium
* fosamprenavir calcium
* heptacalcium
* hexacalcium
* monocalcium
* nonacalcium
* noncalcium
* octacalcium
* organocalcium
* oxycalcium
* pentacalcium
* radiocalcium
* tetracalcium
* tricalcium

#### Related terms

* BSCCO
* calcia
* calcite
* calculus
* calx
* Ca²⁺

#### Translations
### See also

* chalk
* lime
* limestone

### References

* ↑ Chambers Dictionary of Etymology, Robert K. Barnhart (ed.), Chambers, 1988
* Calcium on the British Royal Society of Chemistry's online periodic table

### Further reading

* Calcium in the Encyclopædia Britannica (11th edition, 1911)

## Danish
### Etymology

From Latin calx +‎ -ium.

### Alternative forms

* kalcium

### Noun

calcium n (singular definite calciummet, not used in plural form)
* calcium
    Coordinate term: kalk

#### Declension
### References

* “calcium” in Den Danske Ordbog

## Dutch
### Etymology

Ultimately from English calcium. Coined by Humphry Davy.

### Pronunciation

* IPA: /ˈkɑl.siˌʏm/
* Audio:(file)
* Hyphenation: cal‧ci‧um

### Noun

calcium n (uncountable)
* calcium [from early 19th c.]

#### Derived terms

* calciumoxide
* calciumzout

#### Related terms

* kalk

## French
### Pronunciation

* IPA: /kal.sjɔm/
* Audio:(file)

### Noun

calcium m (uncountable)
* calcium

#### Related terms

* calcaire
* calcifier
* calcique

#### Descendants

* Lingala: kalisu

### Further reading

* “calcium”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

## Interlingua
### Noun

calcium (uncountable)
* calcium

## Latin
### Pronunciation

* (Classical Latin) IPA: /ˈkal.ki.um/, [ˈkäɫ̪kiʊ̃ˑ]
* (modern Italianate Ecclesiastical) IPA: /ˈkal.t͡ʃi.um/, [ˈkäl̠ʲt͡ʃium]

### Etymology 1

Form of calx.

#### Noun

calcium
* genitive plural of calx

### Etymology 2

Derived from calx, calcis (“chalk”) +‎ -ium (chemical element suffix).

#### Noun

calcium n (genitive calciī); second declension
* (New Latin) calcium

##### Declension

Second-declension noun (neuter).

##### Descendants

* → Catalan: calci
* → French: calcium
* → Galician: calcio
* → Italian: calcio
* → Portuguese: cálcio
* → Romanian: calciu
* → Spanish: calcio