protopineWiktionary 原文构词拆分proto-前缀An early, primitive stage of development. · Original, older.+opium词根/词干+-ine后缀(chiefly no longer productive) Of or pertaining to. · Used to form demonyms.词源说明From proto- + opium + -ine.释义（英文）名词 Noun(biochemistry) A benzylisoquinoline alkaloid occurring in plants of the family Papaveraceae that has partial agonism for mu and delta opioid receptors, these effects are nalaxone reversible.