arachnid
noun [ C ] biology specialized uk/əˈræk.nɪd/ us/əˈræk.nɪd/
蜘形纲动物（包括蜘蛛、蝎子、蝉和螨）
any of a group of small animals, similar to insects but with four pairs of legs, that include spiders, scorpions, ticks, and mites
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