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.]
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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