Physical isomerism
Isomerism I*som"er*ism, n. (Chem.) The state, quality, or relation, of two or more isomeric substances. [1913 Webster]

{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]


The Collaborative International Dictionary of English. 2000.

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  • Isomerism — I*som er*ism, n. (Chem.) The state, quality, or relation, of two or more isomeric substances. [1913 Webster] {Physical isomerism} (Chem.), a former term for {optical isomerism}. {optical isomerism} (Chem.), the condition or relation of certain… …   The Collaborative International Dictionary of English

  • isomerism — /uy som euh riz euhm/, n. 1. Chem. the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism), as CH3OCH3 and… …   Universalium

  • isomerism — The existence of a chemical compound in two or more forms that are identical with respect to percentage composition but differ as to the positions of one or more atoms within the molecules, as well as in physical and chemical properties.… …   Medical dictionary

  • isomerism — noun the state of being an isomer; the complex of chemical and physical phenomena characteristic of isomers • Hypernyms: ↑state …   Useful english dictionary

  • optical isomerism — Isomerism I*som er*ism, n. (Chem.) The state, quality, or relation, of two or more isomeric substances. [1913 Webster] {Physical isomerism} (Chem.), a former term for {optical isomerism}. {optical isomerism} (Chem.), the condition or relation of… …   The Collaborative International Dictionary of English

  • Cis–trans isomerism — Cis but 2 ene Trans but 2 ene In organic che …   Wikipedia

  • Cis-trans isomerism — In chemistry, cis trans isomerism or geometric isomerism or configuration isomerism is a form of stereoisomerism describing the orientation of functional groups within a molecule. In general, such isomers contain double bonds, which cannot rotate …   Wikipedia

  • Conformational isomerism — Conformers of butane, shown in Newman projection. The two gauche as well as the anti form are staggered conformations In chemistry, conformational isomerism is a form of stereoisomerism in which the isomers can be interconverted exclusively by… …   Wikipedia

  • structural isomerism — noun : isomerism in which atoms are linked in a different order sometimes distinguished from stereoisomerism; compare position isomerism * * * Chem. See under isomerism (def. 1). [1925 30] * * * structural isomerism noun (chem) The prope …   Useful english dictionary

  • optical isomerism — noun : stereoisomerism in which the isomers have different effects on polarized light and in which asymmetry of the molecule as a whole or the presence of one or more asymmetric atoms is held to be responsible for such effects compare asymmetric… …   Useful english dictionary

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