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From The Collaborative International Dictionary of English v.0.48:
Nonone \Non"one\, n. [Nonane + -one, suffix denoting the third degree of unsaturation.] (Chem.) 1. Any one of several metameric unsaturated hydrocarbons (C9H14) of the valylene series. [archaic?] [1913 Webster] 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. [PJC]