terpenes

Also contains definition of: monoterpenes

Hydrocarbons of biological origin having carbon skeletons formally derived from isoprene [CH2=C(CH3)CH=CH2]. This class is subdivided into the C5 hemiterpenes, C10 monoterpenes, C15 sesquiterpenes, C20 diterpenes, C25 sesterterpenes, C30 triterpenes, C40 tetraterpenes (carotenoids) and C5n polyterpenes.
See also: carotenes, carotenoids, isoprenoids, prenols, retinoids, steroids, terpenoids
Source:
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1371