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Arachnida

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
A`rach´ni`da
n. pl.1.(Zool.) One of the classes of Arthropoda. See Illustration in Appendix.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.ArachnidaArachnida - a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings
class Arachnida
Chelicerata, superclass Chelicerata - spiders; scorpions; horseshoe crabs
arachnid, arachnoid - air-breathing arthropods characterized by simple eyes and four pairs of legs
Opiliones, order Opiliones, order Phalangida, Phalangida - harvestmen
order Scorpionida, Scorpionida - true scorpions
Chelonethida, order Chelonethida, order Pseudoscorpiones, order Pseudoscorpionida, Pseudoscorpiones, Pseudoscorpionida - false scorpions
order Pedipalpi, order Uropygi, Pedipalpi, Uropygi - whip scorpions
Araneae, Araneida, order Araneae, order Araneida - spiders
Acarina, order Acarina - mites and ticks
class - (biology) a taxonomic group containing one or more orders
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Ticks are blood-sucking ectoparasites of the class Arachnida.
Tick in the ear by Raman, Rajagopalan / Ear, Nose and Throat Journal
Selections from Bobby's spider journal are inserted throughout the story, providing a great deal of information about Arachnida.
Spider Boy by Watson, Elizabeth S. / The Horn Book Magazine
Spiders belong to the class arachnida, which includes scorpions, ticks and mites.
GARDENING\Caught in web of bad image, spider a helper to gardeners by Daily News (Los Angeles, CA)
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