The Collaborative International Dictionary
Heptine
Heptine \Hep"tine\, n. [Heptane + -ine.] (Chem.) Any one of a series of unsaturated metameric hydrocarbons, C7H12, of the acetylene series.
Wiktionary
heptine
n. (context organic compound English) Any of a series of unsaturated metameric hydrocarbons, C7H12, of the acetylene series.