-one /(ōn)/

-one
  1. A suffix indicating that the substance, in the name of which it appears, is a ketone; as, acetone. (Chem.)

-one

suff.
  1. A termination indicating that the hydrocarbon to the name of which it is affixed belongs to the fourth series of hydrocarbons, or the third series of unsaturated hydrocarbons; as, nonone. (Chem.) [archaic]