-on

suffix Physics, Biochemistry, & Chemistry forming nouns:
1》 denoting subatomic particles or quanta: neutron.
2》 denoting molecular units: codon.
3》 denoting substances: interferon.
Origin
sense 1 orig. in electron, from ion, influenced (as in sense 2) by Gk on 'being'; sense 3 is on the pattern of words such as cotton or from Ger. -on.

English new terms dictionary. 2014.

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