Eurypteroidea
Pronunciation : Eu*ryp`te*roi"de*a
Part of Speech : n.
Etymology : [NL. See Eurypteroid.] (Paleont.)
Definition : Defn: An extinct order of Merostomata, of which the genus Eurypterus is the type. They are found only in Paleozoic rocks. [Written also Eurypterida.]
pl.
Source : Webster's Unabridged Dictionary, 1913