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eurypteroidea |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Eurypteroidea \Eu*ryp`te*roi"de*a\, n. pl [NL. See {Eurypteroid}.] (Paleont.) An extinct order of Merostomata, of which the genus Eurypterus is the type They are found only in Paleozoic rocks. [Written also {Eurypterida}.]