–on1
suff.
- Subatomic particle: baryon.
- Unit; quantum: photon.
- Basic hereditary unit: codon.
[From ION.]
–on2
suff.
Inert gas: radon.
[New Latin, from (ARG)ON.]
–on3
suff.
A chemical compound that is not a ketone or a compound that contains oxygen in a carbonyl group: parathion.
[Alteration of –ONE.]





