Definition of -on in English:

-on

Syllabification: -on

suffix

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

Origin

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.

Definition of -on in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous