ARACHNIDA • DICTIONARY ONE.COM • Definition of Arachnida

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noun

Arachnida n. pl. (Zool.) One of the classes of Arthropoda. Note: They have four pairs of legs, no antennae nor wings, a pair of mandibles, and one pair of maxillae or palpi. The head is usually consolidated with the thorax. The respiration is either by trancheae 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.

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Etymology of 'Arachnida'

Collaborative International Dictionary of English 0.48

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Words linked to "Arachnida" : order Phalangida, Pseudoscorpionida, order Chelonethida, order Pseudoscorpiones, arachnid, class, order Uropygi, class Arachnida, order Araneida, order Acarina, Scorpionida, Phalangida, Uropygi, order Scorpionida, Chelicerata, order Pedipalpi, order Pseudoscorpionida, superclass Chelicerata, Pedipalpi