Definition of terpinene
plural -s
: any of three liquid isomeric monocyclic terpene hydrocarbons C10H16 obtained usually in mixtures of the alpha and gamma isomers (as by isomerization of pinene, alpha-phellandrene, or dipentene with sulfuric acid): such as
a
: the isomer that has an odor like that of lemons and is the principal component of the mixtures and that occurs in coriander oil, chenopodium oil, and other essential oils; 1,3-para-mentha-diene — called also
alpha-terpinene
b
: the isomer that occurs in coriander oil, lemon oil, and other essential oils; 1,4-para-menthadiene — called also
crithmene, gamma-terpinene
