Definitions for "Eurypterid"
Sea scorpion; a pincer-bearing Paleozoic arthropod related to horseshoe crabs.
Eurypterid - An extinct order of merostomes, characterized by a body tapered toward the abdomen and six pairs of appendages; one pair was flattened and served as paddles for swimming.
large extinct scorpion-like arthropod considered related to horseshoe crabs