1. Any of the three one-eyed Titans who forged thunderbolts for Zeus.
2. Any of a race of one-eyed giants, reputedly descended from these Titans, inhabiting the island of Sicily.
3. Etymology: derived from two Greek words meaning "circle" and "eye".

We have adopted cyclops in the field of biology to describe the group of tiny, free-swimming crustaceans which have a single eye.

Cyclopie is an adjective meaning "monstrous". Cyclopia is a noun used for a massive abnormality in which the eyes are partly or completely fused.

The word has been used as a root to describe a wheel in such words as tricycle, bicycle, and motorcycle. It is also used to describe a violent storm which moves in a circle; such as, a cyclone.

It also appears in the word encyclopedia to describe circular (or complete) learning. A cyclotron is a large apparatus used for the multiple acceleration of ions to very high speeds.