co 音标拼音: [k'o]
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CO n 1 :
an odorless very poisonous gas that is a product of incomplete combustion of carbon [
synonym : {
carbon monoxide },
{
carbon monoxide gas }, {
CO }]
2 :
a hard ferromagnetic silver -
white bivalent or trivalent metallic element ;
a trace element in plant and animal nutrition [
synonym : {
cobalt }, {
Co }, {
atomic number 27 }]
3 :
one who refuses to serve in the armed forces on grounds of conscience [
synonym : {
conscientious objector }, {
CO }]
4 :
a state in west central United States in the Rocky Mountains [
synonym : {
Colorado }, {
Centennial State }, {
CO }]
Ketone \
Ke "
tone \ (
k [=
e ]"
t [=
o ]
n ),
n . [
Cf . {
Acetone }.] (
Chem .)
One of a large class of organic substances resembling the aldehydes ,
obtained by the distillation of certain salts of organic acids and consisting of carbonyl ({
CO })
united with two hydrocarbon radicals .
In general the ketones are colorless volatile liquids having a pungent ethereal odor .
[
1913 Webster ]
Note :
The ketones are named by adding the suffix -
one to the stems of the organic acids from which they are respectively derived ;
thus ,
acetic acid gives acetone ;
butyric acid ,
butyrone ,
etc .
[
1913 Webster ]
Acyl \
Ac "
yl \,
n . [
Acid -
yl .] (
Org .
Chem .)
An acid radical ,
as acetyl ,
malonyl ,
or benzoyl .
An acyl radical can be depicted as {
R -
CO -},
where {-
CO -}
is the carbonyl group ,
and R is the group that characterizes the acyl moiety .
[
Webster 1913 Suppl .
PJC ]
Carbonic \
Car *
bon "
ic \,
a . [
Cf .
F .
carbonique .
See {
Carbon }.]
(
Chem .)
Of ,
pertaining to ,
or obtained from ,
carbon ;
as ,
carbonic oxide .
[
1913 Webster ]
{
Carbonic acid } (
Chem .),
an acid {
HO .
CO .
OH },
not existing separately ,
which ,
combined with positive or basic atoms or radicals ,
forms carbonates .
In common language the term is very generally applied to a compound of carbon and oxygen , {
CO2 },
more correctly called {
carbon dioxide }.
It is a colorless ,
heavy ,
irrespirable gas ,
extinguishing flame ,
and when breathed destroys life .
It can be reduced to a liquid and solid form by intense pressure .
It is produced in the fermentation of liquors ,
and by the combustion and decomposition of organic substances ,
or other substances containing carbon .
It is formed in the explosion of fire damp in mines ,
and is hence called {
after damp };
it is also know as {
choke damp },
and {
mephitic air }.
Water will absorb its own volume of it ,
and more than this under pressure ,
and in this state becomes the common soda water of the shops ,
and the carbonated water of natural springs .
Combined with lime it constitutes limestone ,
or common marble and chalk .
Plants imbibe it for their nutrition and growth ,
the carbon being retained and the oxygen given out .
{
Carbonic oxide } (
Chem .),
a colorless gas , {
CO },
of a light odor ,
called more correctly {
carbon monoxide }.
It is almost the only definitely known compound in which carbon seems to be divalent .
It is a product of the incomplete combustion of carbon ,
and is an abundant constituent of water gas .
It is fatal to animal life ,
extinguishes combustion ,
and burns with a pale blue flame ,
forming carbon dioxide .
[
1913 Webster ]
Carbonyl \
Car "
bon *
yl \,
n . [
Carbon -
yl .] (
Chem .)
The radical ({=
CO }),
occuring ,
always combined ,
in many compounds ,
as the aldehydes ,
the ketones ,
urea ,
carbonyl chloride ,
etc .
[
1913 Webster ]
Note :
Though denoted by a formula identical with that of carbon monoxide ,
it is chemically distinct ,
as carbon seems to be divalent in carbon monoxide ,
but tetravalent in carbonyl compounds .
[
1913 Webster ]
{
Carbonyl chloride } (
Chem .),
a colorless gas , {
COCl2 },
of offensive odor ,
and easily condensable to liquid .
It is formed from chlorine and carbon monoxide ,
under the influence of light ,
and hence has been called {
phosgene },
or {
phosgene gas }; --
called also {
carbon oxychloride }.
It is used in chemical synthesis ,
and was also used as a poison gas in World War I .
[
1913 Webster PJC ]
Co \
Co \
n .
the chemical formula for {
cobalt },
a ferromagnetic metal of atomic number 27 .
Syn :
cobalt ,
atomic number 27 .
[
WordNet 1 .
5 ]
Co - \
Co -\ (
k [-
o ]-).
A form of the prefix com -,
signifying with ,
together ,
in conjunction ,
joint .
It is used before vowels and some consonants .
See {
Com -}.
[
1913 Webster ]
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