One of the mysteries of the English language finally explained.
Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.
- ‘An aromatic molecule containing two nitro groups will have three positional isomers.’
- ‘The plant material contains only the active isomers.’
- ‘Conjugated linoleic acid is a mixture of positional and geometric isomers of linoleic acid.’
- ‘There is evidence that tocopherol isomers differ from each other in their functional properties.’
- ‘In 1907, he synthesized a pair of geometric isomers that confirmed his predictions.’
- ‘However, several research groups have suggested cis isomers of lycopene are better absorbed than the all-trans form.’
Each of two or more atomic nuclei that have the same atomic number and the same mass number but different energy states.
- ‘One form is called the (+) isomer because it rotates polarized light to the right, in a positive direction.’
- ‘The article proclaimed the dawn of the age of atomic aircraft powered by hafnium-178 isomer reactors.’
- ‘Constitutional isomers are isomers that have different atomic connectivities.’
Mid 19th century: from Greek isomerēs ‘sharing equally’, from isos ‘equal’ + meros ‘a share’.
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