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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First Known Use of Chelicerata

1919, in the meaning defined above

History and Etymology for Chelicerata

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

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The first known use of Chelicerata was in 1919

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