Nonone /(?)/

Non·one

Nonone

n.
  1. Any one of several metameric unsaturated hydrocarbons (C9H14) of the valylene series. (Chem.) [archaic?]
  2. Any of several isomeric ketones (C9H18O) conceptually derived from nonane by substituting an oxygen for two hydrogen atoms on one of the non-terminal carbon atoms.