isomer

 
Pronunciation: /ˈʌɪsəmə/

noun

  • 1 Chemistry each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.
  • 2 Physics each of two or more atomic nuclei that have the same atomic number and the same mass number but different energy states.

Derivatives

isomeric

Pronunciation: /-ˈmɛrɪk/
adjective

isomerism

Pronunciation: /ʌɪˈsɒmərɪz(ə)m/
noun

isomerize

Pronunciation: /ʌɪˈsɒmərʌɪz/
(also isomerise) verb

Origin:

mid 19th century: from Greek isomerēs 'sharing equally', from isos 'equal' + meros 'a share'