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definition of the word calcium

by the Wiktionnary

Chemical element
Ca Previous: potassium (K)
Next: scandium (Sc)

A New Latin word derived by Sir Humphry Davy in 1808, from Latin calx ("lime", "limestone") because it occurs in limestone.[1]

Wikipedia has an article on:
Calcium

Wikipedia

Singular
calcium

Plural
uncountable

calcium (uncountable) (Symbol: Ca)

  1. A chemical element, atomic number 20, that is an alkaline earth metal and occurs naturally as carbonate in limestone and as silicate in many rocks.


Definition from Wiktionary
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