noun
a small arachnid belonging to the Acaridae family, commonly known as a mite
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The acarid mites were found in the carpets of the old library.
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I heard there were acarid mites in the old rug at grandma's house.
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Those acarid critters are causing havoc in the basement.
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The acarid of doubt had infested his mind, causing him to second-guess every decision.