'Eurypterida' definitions:
Definition of 'Eurypterida'
From: WordNet
noun
Extinct aquatic arthropods of the Paleozoic [syn: Eurypterida, order Eurypterida]
Definition of 'Eurypterida'
From: GCIDE
- Eurypteroidea \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.] [1913 Webster]