Webster's English Dictionary

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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