perianth (n.)youdaoicibaDictYouDict[perianth 词源字典]
"envelope of a flower," 1706, from French périanthe, from Modern Latin perianthium (17c.), literally "that which is round the flower," from peri- (see peri-) + Greek anthos "flower" (see anther).[perianth etymology, perianth origin, 英语词源]