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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Mer·o·stom·a·ta prop. n. pl.  Zool. A class of Arthropoda, allied to the Crustacea.  It includes the trilobites, Eurypteroidea, and Limuloidea.  All are extinct except the horseshoe crabs (Limulus) of the last group. See Limulus.
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From: WordNet (r) 2.0

 Merostomata
      n : used in some classifications; includes the orders Xiphosura
          and Eurypterida [syn: class Merostomata]