Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of isomerism is as below...

Ortho- :: Ortho- () Connection with, or affinity to, one variety of isomerism, characteristic of the benzene compounds; -- contrasted with meta- or para-; as, the ortho position; hence, designating any substance showing such isomerism; as, an ortho compound..

Isomerism :: Isomerism (n.) The state, quality, or relation, of two or more isomeric substances..

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