calcium 音标拼音: [k'ælsiəm]
n . 钙
钙
calcium n 1 :
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 [
synonym :
{
calcium }, {
Ca }, {
atomic number 20 }]
Calcium \
Cal "
ci *
um \ (
k [
a ^]
l "
s [
i ^]*[
u ^]
m ),
n . [
NL .,
from L .
calx ,
calcis ,
lime ;
cf F .
calcium .
See {
Calx }.] (
Chem .)
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 .
[
1913 Webster ]
Note :
Calcium is widely and abundantly disseminated ,
as in its compounds calcium carbonate or limestone ,
calcium sulphate or gypsum ,
calcium fluoride or fluor spar ,
calcium phosphate or apatite .
[
1913 Webster ]
{
Calcium light },
an intense light produced by the incandescence of a stick or ball of lime in the flame of a combination of oxygen and hydrogen gases ,
or of oxygen and coal gas ; --
called also {
Drummond light }
and {
lime light }.
[
1913 Webster PJC ]
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