Dictionary entry

Merostomata

Webster's Dictionary 1913

‖Mer′o‐stom″a‐ta (?), n. pl.(Zoöl.) A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs of the last group. See Limulus.