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English definition of “arachnid”

arachnid

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