Meaning

noun (Greek mythology) one of a race of giants having a single eye in the middle of their forehead

noun minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms th

originBorrowed from Latin cyclōps, from Ancient Greek Κύκλωψ (Kúklōps, “Cyclops ['round eyes']”). The sense for copepods is a semantic loan from translingual Cyclops.

Etymology from Wiktionary, CC BY-SA 3.0