structural isomerism

noun Chemistry.

See under isomerism(def 1).

Origin of structural isomerism

First recorded in 1925–30

isomerism

[ahy-som-uh-riz-uh m]

noun

Chemistry. 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 CH3CH2OH, or in the arrangement of their atoms in space and therefore in one or more properties.Compare optical isomerism, stereoisomerism.
Also called nuclear isomerism. Physics. the relation of two or more nuclides that have the same atomic number and mass number but different energy levels and half-lives.
Chemistry, Physics. the phenomenon characterized by such a relation.
the state or condition of being isomerous.

Origin of isomerism

First recorded in 1830–40; isomer(ic) + -ism

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British Dictionary definitions for structural isomerism

isomerism

noun

the existence of two or more compounds having the same molecular formula but a different arrangement of atoms within the moleculeSee also stereoisomerism, optical isomerism
the existence of two or more nuclides having the same atomic numbers and mass numbers but different energy states

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

structural isomerism in Medicine

isomerism

[ī-sŏm′ə-rĭz′əm]

The phenomenon of the existence of isomers.
The complex of chemical and physical phenomena characteristic of or attributable to isomers.
The state or condition of being an isomer.

structural isomerism

Isomerism involving the same atoms in different arrangements.