Wikipedia posted:
In Greek mythology a Cyclops, or Kyklops (Greek Κύκλωψ), is a member of a primordial race of giants, each with a single round eye in the middle of its forehead. The plural is Cyclopes or Kyklopes (Greek Κύκλωπες). The name means "round-" or "wheel-eyed".
Hesiod describes one group of cyclopes and Homer describes another. In Hesiod's Theogony, Zeus releases the Cyclopes, the sons of the sky (Uranus) and the earth (Gaia), from the dark pit of Tartarus. They provide Zeus's thunderbolt, Hades' helmet of invisibility, and Poseidon's trident, and the gods use these weapons to defeat the titans. In a famous passages of Homer's Odyssey, the hero Odysseus encounters the Cyclops Polyphemus, the son of Poseidon and a nereid (Thoosa), who lives with his fellow Cyclopes in a distant country. The connection between the two groups has been debated in antiquity and by modern scholars.