EURYPTERID

[ ˌjʊ(ə)'rɪptərɪd ]

■ noun a giant fossil marine arthropod of a group occurring in the Palaeozoic era, resembling large scorpions.

Origin

C19: from mod. L. Eurypterus (genus name), from eury- + Gk pteron 'wing' + -id 3 .