Arthropoda (n.) Look up Arthropoda at Dictionary.com
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- (1) "a foot" (see foot (n.)). They comprise the vast majority of animals, including insects, spiders, and crustaceans.