Definition of -on in English:

-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 on 'being'; sense 3 is on the pattern of words such as cotton or from German -on.

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Word of the day setose
Pronunciation: ˈsēˌtōs
adjective
bearing bristles or setae; bristly