noreugeninWiktionary 原文英美构词拆解nornor-前缀eugenineugenin词干nor-(organic chemistry) A compound derived from another by removal of a radical, especially by removal of methyl or methylene.词源说明From nor- + eugenin.释义名词noun1(chemistry) A chromone with hydroxy groups at position 5 and 7, and a methyl group at position 2, derived from Pisonia aculeata (5,7-dihydroxy-2-methylchromen-4-one)