An<unk>  is an acid which contains oxygen. More specifically, it is an acid which:
The name<unk>  is sometimes used, although this is not recommended.
Generally,<unk> s are simply polyatomic ions with a hydrogen cation.
Under Lavoisier's original theory, all acids contained oxygen, which was named from the Greek οξυς (oxys) (acid, sharp) and γεινομαι (geinomai) (engender). It was later discovered that some acids, notably hydrochloric acid, did not contain oxygen and so a distinction was made for those that did.
Common<unk> s include:
Halogen<unk> s: Hypochlorous acid; Chlorous acid; Chloric acid; Perchloric acid; Perbromic acid; Metaperiodic acid
Sulfuric acid
Nitric acid
Phosphoric acid
Common acids which are not<unk> s include:
Hydrochloric acid
Hydrofluoric acid
Hydrobromic acid
Hydroiodic acid
Although carboxylic acids fulfill the criteria above, they are not generally considered as<unk> s.
All<unk> s have the acidic hydrogen bound to an oxygen atom, so bond strength (length) is not a factor as it is with binary nonmetal hydrides. Rather, the electronegativity of the central atom (E) and the number of O atoms determine<unk>  acidity. With the same number of oxygens around E, acid strength increases with the electronegativity of E.
Oxoacid
Carbide
8-Hyydroxyquinoline
Acyl
Lime 
Dichloroacetic acid
Antacid
Oxamyl