Terpenes create the flavor profile in cannabis flower and they are oils that are secreted in the same glands as cannabinoids, such as Cannabidiol (CBD) and Tetrahydrocannabinol (THC), and they were developed by the plant to repel predators and lure pollinators. Terpenes can be found in other plants as well, not just cannabis.
Merriam-Webster Online Dictionary
terpene (noun)any of various isomeric hydrocarbons CH found present in essential oils (as from conifers) and used especially as solvents and in organic synthesis - 10 16 , broadly any of numerous hydrocarbons (CH) found especially in essential oils, resins, and balsams - 5 8 n
isoprenoid, hydrocarbon, essential oil, aromatic compound, volatile organic compound
