Etymology
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Arthropoda (n.)

phylum of articulated invertebrates, 1849, Modern Latin, literally "those with jointed feet," coined 1845 by German zoologist Karl Theodor Ernst von Siebold (1804-1885) from Greek arthron "a joint" (from PIE root *ar- "to fit together") + podos genitive of pous "foot" (from PIE root *ped- "foot"). They comprise the vast majority of animals, including insects, spiders, and crustaceans.

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Definitions of Arthropoda

Arthropoda (n.)
jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedes;
Synonyms: phylum Arthropoda
From wordnet.princeton.edu