metaformaldehydeWiktionary 原文英美构词拆解metameta-前缀formaldehydeformaldehyde词干meta-(anatomy and zoology) Behind. [From 19th century] · (botany and zoology) Later or subsequent. [From 19th century]词源说明From meta- + formaldehyde.释义名词noun1(organic chemistry) 1,3,5-trioxane