Chelicerata

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plural noun Che·lic·er·ata \kə-ˌli-sə-ˈrä-tə, -ˈrā-tə\

Definition of Chelicerata

: a subphylum or other division of the phylum Arthropoda comprising forms having chelicerae and lacking antennae and including the horseshoe crabs and eurypterids, spiders, scorpions, and sea spiders A fossil eurypterid, representing the Chelicerata. — Stephen Jay Gould, Wonderful Life, 1989 — see arachnida merostomata pycnogonida

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Origin and Etymology of chelicerata

borrowed from New Latin, Latinization (with New Latin -ata -ata) of French chélicérés, from chélicère chelicera + -és, plural of -é, adjective and participle ending going back to Latin -ātus ³-ate