The Greek root word *cycl* means "circle." This Greek root is the word origin of a number of English vocabulary words, including uni[*cycl*]e, re[*cycl*]e, and [*Cycl*]ops. Perhaps the easiest way to remember that the Greek root word *cycl* means "circle" is through the word bi[*cycl*]e, which possesses two "circles" in the form of wheels.