-on

-on

1
a suffix used in the names of subatomic particles (gluon; meson; neutron ), quanta (graviton ), and other minimal entities or components (cistron; codon; magneton; photon ).

Origin:
probably extracted from ion; cf. proton

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-on

2
a suffix used in the naming of inert gaseous elements: neon.

Origin:
Greek -on, neuter of -os adj. ending

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-on
 
suffix forming nouns
1.  indicating a chemical substance: interferon; parathion
2.  (in physics) indicating an elementary particle or quantum: electron; photon
3.  (in chemistry) indicating an inert gas: neon; radon
4.  (in biochemistry) a molecular unit: codon; operon
 
[from ion]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

-on
subatomic particle suffix, from ion.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

-on 1
suff.

  1. A subatomic particle: neutron.

  2. A unit: photon.

  3. A basic hereditary unit: codon.

-on 2
suff.
Inert gas: radon.

-on 3
suff.
A chemical compound that is not a ketone or a compound that contains oxygen in a carbonyl group: parathion.

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