[-on] n suffix [ISV, alter. of -one]: chemical compound not a ketone or other oxo compound "parathion"
[2]-on n suffix [fr. -on (in ion)] 1: subatomic particle "nucleon"
2. a: unit: quantum "photon" "magneton" b: basic hereditary component "cistron" "operon" [3]-on n suffix [NL, fr. -on (in argon)]: noble gas "radon"