• (n.) Any one of several metameric unsaturated hydrocarbons (C9H14) of the valylene series. • (n.) Any one of several metameric unsaturated hydrocarbons (C9H14) of the valylene series.
Non'one noun [ Non ane + - one , suffix denoting the third degree of unsaturation.] (Chemistry) Any one of several metameric unsaturated hydrocarbons (C 9 H 14 ) of the valylene series.