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]
arthropod (n.)youdaoicibaDictYouDict
1877, from Modern Latin Arthropoda, literally "those with jointed feet," biological classification of the phylum of segmented, legged invertebrates; see Arthropoda.
entomology (n.)youdaoicibaDictYouDict
1764, from French entomologie (1764), coined from -logie "study of" (see -logy) + Greek entomon "insect," neuter of entomos "cut in pieces, cut up," in this case "having a notch or cut (at the waist)," from en "in" (see en- (2)) + temnein "to cut" (see tome).

Insects were so called by Aristotle in reference to the segmented division of their bodies. Compare insect, which is from a Latin loan-translation of the Greek word. Related: Entomological; entomologically. Hybrid insectology (1766, from French insectologie, 1744) is not much used.
I have given the name insectology to that part of natural history which has insects for its object; that of entomology ... would undoubtedly have been more suitable ... but its barbarous sound terryfy'd me. [Charles Bonnet's English translation of his "Contemplation de la nature," 1766]
segment (v.)youdaoicibaDictYouDict
1859, intransitive, in reference to cell division, from segment (n.). Transitive sense, "divide (something) into segments" is from 1872. Related: Segmented; segmenting.
crinetyoudaoicibaDictYouDict
"A set of segmented metal plates which cover the top and sides of a horse's neck as part of its protective armour. Compare crinière; cranet. Now historical", Late 15th cent.; earliest use found in The Book of St. Albans. Apparently from Middle French crin hair + -et; compare Old French crignete hair, mane.
arthrozoicyoudaoicibaDictYouDict
"(In some former classifications) designating a division of the Metazoa including arthropods and segmented worms (corresponding broadly to the Articulata of Cuvier); relating to this group", Late 19th cent.; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From arthro- + -zoic, after scientific Latin Arthrozoa, former group name.
Christmas cactusyoudaoicibaDictYouDict
"A South American cactus with flattened segmented stems and red, pink, or white flowers, grown as a houseplant", So named because it flowers at about the northern midwinter.