Etymology
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eurypterid (n.)

fossil swimming crustacean of the Silurian and Devonian, 1874, from Greek eurys "broad, wide" (see eury-) + pteron "feather, wing" (from PIE root *pet- "to rush, to fly"); so called from their swimming appendages.

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Definitions of eurypterid

eurypterid (n.)
large extinct scorpion-like arthropod considered related to horseshoe crabs;
From wordnet.princeton.edu