oh 音标拼音: ['o]
int . (表示惊讶,恐怖,赞叹)哦!
OH n 1 :
a midwestern state in north central United States in the Great Lakes region [
synonym : {
Ohio }, {
Buckeye State }, {
OH }]
Oh \
Oh \ ([=
o ]),
interj . [
See {
O },
interj .]
An exclamation expressing various emotions ,
according to the tone and manner ,
especially surprise ,
pain ,
sorrow ,
anxiety ,
or a wish .
See the Note under {
O }.
[
1913 Webster ]
-
ol \-
ol \ (-[=
o ]
l or -[
o ^]
l )
suff . [
From alcohol .] (
Chem .)
A suffix denoting that the substance in the name of which it appears belongs to the series of alcohols or hydroxyl derivatives ,
as ethanol ,
carbinol ,
phenol ,
glycerol ,
etc .
Such compounds contain the hydroxy radical ({-
OH }).
[
1913 Webster PJC ]
molecular formula \
mo *
lec "
u *
lar form "
u *
la \,
n . (
Chem .)
An expression representing the composition of elements in a chemical substance ,
commonly consisting of a series of letters and numbers comprising the atomic symbols of each element present in a compound followed by the number of atoms of that element present in one molecule of the substance .
Thus the molecular formula for common alcohol (
ethyl alcohol )
is {
C2H6O },
meaning that each molecule contains two carbon atoms ,
six hydrogen atoms ,
and one oxygen atom .
The molecular formula may be written to provide some indication of the actual structure of the molecule ,
in which case structural units may be written separately .
Thus ,
ethyl alcohol can also be written as {
CH3 .
CH2 .
OH }
or {
CH3 -
CH2 -
OH },
in which the period or dash between functional groups indicates a single bond between the principle atoms of each group .
This formula shows that in ethyl alcohol ,
the carbon of a methyl group ({
CH3 -})
is attached to the carbon of a methylene group ({-
CH2 -}),
which is attached to the oxygen of a hydroxyl group ({-
OH }).
A {
structural formula }
is a graphical depiction of the relative positions of atoms in a molecule ,
and may be very complicated .
[
PJC ]
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