pə̇ˈmanˌthrēn noun
( -s )
Etymology: pim aric (in pimaric acid ) + -anthrene
: a crystalline aromatic tricyclic hydrocarbon (CH 3 ) 2 C 14 H 8 obtained by dehydrogenation of various bicyclic or tricyclic diterpenes and by synthesis; 1,7-dimethyl-phenanthrene