peony (n.)youdaoicibaDictYouDict[peony 词源字典]
a 16c. merger of Middle English pyony (from Old English peonie) and Old North French pione (Modern French pivoine), both from Late Latin peonia, from Latin pæonia, from Greek paionia (fem. of paionios), perhaps from Paion, physician of the gods (or Apollo in this aspect), and so called for the plant's healing qualities. The root, flowers, and seeds formerly were used in medicine.[peony etymology, peony origin, 英语词源]