Cyclopia is a rare congenital disorder in which an individual is born with a single eye or a partially formed eye in the center of their forehead. Synonyms for cyclopia include one-eyed, monoculus, and cyclopic. Other related terms that are sometimes used include synophthalmia, which refers to the fusion of both eyes into one, and synotia, which is the fusion of the ears. Cyclocephaly is another term that may be used to describe cyclopia, as it involves the development of a single, central brain structure instead of the usual two hemispheres. Overall, these terms are typically used in medical contexts to describe rare and unusual developmental anomalies.