Definition of -on in English:



Physics Biochemistry Chemistry
  • 1Forming nouns denoting subatomic particles or quanta.

    • ‘photon’
  • 2Forming nouns denoting molecular units.

    • ‘codon’
  • 3Forming nouns denoting substances.

    • ‘interferon’


-on (sense 1) originally in electron, from ion, influenced (as in -on (sense 2)) by Greek on ‘being’; -on (sense 3) is on the pattern of words such as cotton or from German -on.