Definition of arachnid
: any of a class (Arachnida) of arthropods comprising chiefly terrestrial invertebrates, including the spiders, scorpions, mites, and ticks, and having a segmented body divided into two regions of which the anterior bears four pairs of legs but no antennae
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Merriam-Webster unabridged
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Time Traveler for arachnid
The first known use of arachnid was in 1826
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