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isomerism

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Isomerism \I*som"er*ism\, noun (Chem.) The state, quality, or relation, of two or more isomeric substances.

{Physical isomerism} (Chem.), a former term for {optical isomerism}.

{optical isomerism} (Chem.), the condition or relation of certain (isomeric) substances, which, while chemically identical (in that they have the same composition, the same molecular weights, and the same ultimate constitution), are yet physically different, as in their action on polarized light, as dextro- and l[ae]vo-tartaric acids, or the sugars galactose and glucose. In such compounds there is usually at least one unsymmetrical carbon atom and typically more than one. See {Unsymmetrical}. [1913 Webster +PJC]

From WordNet (r) 3.0 (2006) [wn]:

isomerism

noun

1: the state of being an isomer; the complex of chemical and physical phenomena characteristic of isomers


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