We don't have synonyms for terpenoids yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are terpenoid and diterpenoids.
(n) :
(organic chemistry) Any of a very large class of naturally occurring and synthetic organic compounds formally derived from the hydrocarbon isoprene; they include many volatile compounds used in perfume and food flavors, turpentine, the steroids, the carotene pigments and rubber.
(n) :
(organic chemistry) Any of a very large class of naturally occurring and synthetic organic compounds formally derived from the hydrocarbon isoprene; they include many volatile compounds used in perfume and food flavors, turpentine, the steroids, the carotene pigments and rubber.