heptyl

from The American Heritage® Dictionary of the English Language, 5th Edition.

• 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.

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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