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-on1

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

-on2

1.
a suffix used in the naming of inert gaseous elements:
neon.
Origin
Greek -on, neuter of -os adj. ending
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for -on

-on

suffix
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
Word Origin
from ion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for -on

subatomic particle suffix, from ion.

Online Etymology Dictionary, © 2010 Douglas Harper
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-on in Medicine

-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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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