n.
Pronunciation: yu ̇ - ' rip-t ə -r ə d
Function: noun
Etymology: ultimately from Greek eury- + pteron wing ― more at FEATHER
Date: 1871
: any of an order (Eurypterida) of usually large aquatic Paleozoic arthropods resembling scorpions and related to the horseshoe crabs ― called also sea scorpion
– eurypterid adjective
eurypterid