Hypertext Webster Gateway: "Eurypterida"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.]
From WordNet (r) 1.7 (wn)
Eurypterida
n : extinct aquatic arthropods of the Paleozoic [syn: {Eurypterida},
{order Eurypterida}]
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