- nepionic
[nepionic 词源字典]
- "Designating the early postembryonic stages of ontogeny, specifically the stage between the embryonic and the neanic; of, relating to, or at such a stage of development", Late 19th cent. From ancient Greek νήπιος infant, child (of uncertain origin) + -onic.[nepionic etymology, nepionic origin, 英语词源]