kəˌlisəˈräd.ə, -ād.ə noun plural
Usage: capitalized
Etymology: New Latin, from chelicera + -ata
in some classifications : a subphylum or superclass of Arthropoda comprising forms having chelicerate appendages and lacking antennae and including the king crabs and eurypterids, spiders, scorpions, and sea spiders — compare arachnida , merostomata , pycnogonida