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English definition of “arachnid”

arachnid

noun [C]     /əˈræk.nɪd/ specialized
any of a group of small animals , similar to insects but with four pairs of legs , that include spiders , scorpions , ticks , and mites Arachnids
(Definition of arachnid noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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