any of various hydrocarbons present in essential oils, e.g. from conifers, and used esp as solvents and in organic synthesis
terpenic /tuhʹpeenik, tuhʹpenik/ adj
terpenoid /ʹtuhpənoyd, tuhʹpeenoyd/ adj and noun
[terp- from German terpentin turpentine (ultimately from Latin terebinthina resina resin of the terebinth) + -ene]