Definition of -on in English:

-on

suffix

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

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

    ‘codon’
  • 3Forming nouns denoting substances.

    ‘interferon’

Origin

-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.

Pronunciation

-on

/ɒn/