Entry 1 sense Webster, 1913 Heptylic · Hep·tyl·ic · IPA 01 a. Pertaining to, or derived from, heptyl or heptane; as, heptylic alcohol. Cf. Œnanthylic. 1. Pertaining to, or derived from, heptyl or heptane; as, heptylic alcohol. Cf. Œnanthylic.(Chem.) See: Œnanthylic