Etymology
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arthropod (n.)

1862, from Modern Latin Arthropoda, literally "those with jointed feet," biological classification of the phylum of segmented, legged invertebrates (see Arthropoda). As an adjective from 1865.

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Definitions of arthropod

arthropod (n.)
invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin;
From wordnet.princeton.edu