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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Arachnida \A*rach"ni*da\, noun pl. [NL., fr. Gr. ? spider.] (Zo["o]l.) One of the classes of Arthropoda. See Illustration in Appendix.
Note: They have four pairs of legs, no antenn[ae] nor wings, a pair of mandibles, and one pair of maxill[ae] or palpi. The head is usually consolidated with the thorax. The respiration is either by tranche[ae] or by pulmonary sacs, or by both. The class includes three principal orders: {Araneina}, or spiders; {Arthrogastra}, including scorpions, etc.; and {Acarina}, or mites and ticks.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Araneina \A*ra'ne*i"na\ ([.a]*r[=a]'n[-e]*[imac]"n[.a]), noun pl. [NL., fr. L. aranea spider.] (Zo["o]l.) The order of Arachnida that includes the spiders.
Note: They have mandibles, modified as poison fangs, leglike palpi, simple eyes, abdomen without segments, and spinnerets for spinning a web. They breathe by pulmonary sacs and trache[ae] in the abdomen. See Illustration in Appendix.
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