terpene
ter.pene \'t*r-.pe-n\ \.t*r-'pe--nik, -'pen-ik\ \'t*r-p*-.no.id\ n [ISV terp- (fr. G terpentin turpentine, fr. ML terbentina) +]-ene - more at TURPENTINE : any of various isomeric hydrocarbons C10H16 found present in essential oils esp. from conifers and used esp. as solvents and in organic synthesis; broadly : any of numerous hydrocarbons (C5H8)n found esp. in essential oils, resins, and balsams - ter.pe.nic aj