Definitions for arachnida
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Princeton's WordNet
Arachnida, class Arachnida(noun)
a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings
Webster Dictionary
Arachnida(u)
one of the classes of Arthropoda. See Illustration in Appendix
U.S. National Library of Medicine
Arachnida
A class of Arthropoda that includes SPIDERS; TICKS; MITES; and SCORPIONS.
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"arachnida." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/arachnida>.