Octyl :: Octyl (n.) A hypothetical hydrocarbon radical regarded as an essential residue of octane, and as entering into its derivatives; as, octyl alcohol..
Octylene :: Octylene (n.) Any one of a series of metameric hydrocarbons (C8H16) of the ethylene series. In general they are combustible, colorless liquids..
Octylic :: Octylic (a.) Pertaining to, derived from, or containing, octyl; as, octylic ether..