Clipping ofketone, which was analogous tomargarone. Further etymology is unclear.
-one
FromLatin-ōnem.[1]Cognate toSpanish-ón,Portuguese-ão, andFrench-on (whenceEnglish-oon).
-one m (plural-oni,feminine-ona,feminine plural-one)
-one m (plural-oni)
-ōne m
From-onis(“-er”) +-e(fem.).