2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Arachnida \A*rach"ni*da\, n. pl. [NL., fr. Gr. ? spider.] (Zool.) One of the classes of Arthropoda. See Illustration in Appendix. [1913 Webster] 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. [1913 Webster] From The Collaborative International Dictionary of English v.0.48 [gcide]: Arthrogastra \Ar`thro*gas"tra\, n. pl. [NL., fr. Gr. 'a`rqron joint + ? stomach.] (Zool.) A division of the Arachnida, having the abdomen annulated, including the scorpions, harvestmen, etc.; pedipalpi. [1913 Webster]
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