-on
I. noun suffix Etymology: International Scientific Vocabulary, alteration of -one chemical compound not a ketone or other oxo compound <
parathion
>
II. noun suffix Etymology: from -on (in ion) 1. subatomic particle <
nucleon
>
2. a. unit ; quantum <
photon
>
<
magneton
>
b. basic hereditary component <
cistron
>
<
operon
>
III. noun suffix Etymology: New Latin, from -on (in argon) noble gas <
radon
>

New Collegiate Dictionary. 2001.

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