arachnid Definition in Cambridge British English Dictionary
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Definition of "arachnid" - British English Dictionary

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arachnidnoun [C]

uk   us   /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
(Definition of arachnid from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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