adjective. Relating to or being a hydrocarbon unit, C₇H₁₅, that can occur as a substituent in an organic compound or as an ion or radical.

noun. The hypothetical radical (C₇H₁₅) of heptylic alcohol and its derivatives.

noun. A compound radical, C7H15, regarded as the essential radical of heptane and a related series of compounds.

noun. Either of many isomeric univalent hydrocarbon radicals, C7H15, formally derived from heptane by the loss of a hydrogen atom.

"Pinus, which heptane yielded primary heptyl-alcohol, and methyl-pentyl-carbinol, exactly as the heptane obtained from petroleum does (_Annalen de Chemie_, ccxvii., 139, and clxxxviii., 249; and"