The Collaborative International Dictionary
Pentene \Pen"tene\, n. [See Penta-.] (Chem.) Same as Amylene.
n. (context organic compound English) Any of several isomeric alkenes having five carbon atoms and one double bond
Pentenes are alkenes with chemical formula . Each contains one double bond within its molecular structure. There are a total of six different compounds in this class, differing from each other by whether the carbon atoms are attached linearly or in a branched structure, and whether the double bond has a cis or trans form.