Found 2 items, similar to Arachnida.
English → English (WordNet) Definition: Arachnida Arachnida n : a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings [syn: class Arachnida]
English → English (gcide) Definition: Arachnida Arachnida \A*rach"ni*da\, n. pl. [NL., fr. Gr. ? spider.] (Zo["o]l.) 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]