Ortho
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- For the prefix, see wiktionary:ortho-; for the speciality of dentistry, also commonly referred to as ortho-, see orthodontics.
In organic chemistry, ortho (in combination with meta and para) is used to distinguish the three types of isomer of disubstituted aromatic hydrocarbons: it indicates that the substituents are at locants 1 and 2. It is printed in italic type, and is often abbreviated as o in compound names. For example, the compound name ortho-xylene is equivalent to o-xylene.
In inorganic chemistry, ortho was a prefix formally used to to indicate the most hydrated form of an acid.
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