hydrocarbon terpene 2013-03-12T17:24:22Z Any of a large and diverse class of organic compounds which are composed only of hydrogen, the element with atomic number 1, and carbon, the element with atomic number 12, which are derived biosynthetically from units of isoprene and which have the general molecular formula (CH2=C(CH3)CH=CH2)n where n is the number of linked isoprene units. XCO:0000279 experimental_condition_ontology jsmith