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Definition of: eurypterid
(y
·rip′tər·id) noun Paleontol.
Any member of an extinct Silurian order (Eurypterida) of very large aquatic arthropods related to the Arachnida and to the king crab.
—adjective Belonging to this order. [<NL Eurypterida <Gk. eurys broad + pteron wing]
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