annelid (n.)youdaoicibaDictYouDict[annelid 词源字典]
"segmented worm," 1834, from French annélide, source of the phylum name Annelida, coined in Modern Latin 1801 by French naturalist J.B.P. Lamarck (1744-1829), from annelés "ringed ones" (from Latin anulus "little ring," a diminutive of anus; see anus) + Greek eidos "form, shape" (see -oid).[annelid etymology, annelid origin, 英语词源]
annulus (n.)youdaoicibaDictYouDict
1560s, medical, from misspelling of Latin anulus "little ring, finger ring," a diminutive of anus (see anus).