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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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