Heptyl :: Heptyl (n.) A compound radical, C7H15, regarded as the essential radical of heptane and a related series of compounds..
Heptylene :: Heptylene (n.) A colorless liquid hydrocarbon, C7H14, of the ethylene series; also, any one of its isomers. Called also heptene..
Heptylic :: Heptylic (a.) Pertaining to, or derived from, heptyl or heptane; as, heptylic alcohol. Cf. /nanthylic..