Definition of -on in English:


Syllabification: -on


Physics, Biochemistry, & Chemistry
  • Forming nouns:
  • 1Denoting subatomic particles or quanta: neutron photon
  • 2Denoting molecular units: codon
  • 3Denoting substances: interferon


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

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a tortoiseshell cat