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cyclops (n.)

(plural cyclopes), 1510s, from Latin, from Greek kyklops, literally "round-eyed," from stem of kyklos "circle, circular body" (from PIE root *kwel- (1) "revolve, move round") + ops "eye" (from PIE root *okw- "to see"). One of a race of one-eyed giants who forged thunderbolts for Zeus, built the walls of Mycenae, etc.