Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of eurypteroid is as below...

Merostomata :: Merostomata (n. pl.) 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..

Eurypteroid :: Eurypteroid (a.) Like, or pertaining to, the genus Euryperus..

Eurypteroidea :: Eurypteroidea (n. pl.) An extinct order of Merostomata, of which the genus Eurypterus is the type. They are found only in Paleozoic rocks..

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