Coreclisis is a medical term used to describe the blockage or obstruction of a blood vessel. The word is pronounced /kɔːrˈɛklɪsɪs/ with the stress on the second syllable. The spelling of the word is derived from the Greek words "kore" meaning pupil and "klisis" meaning closure. Coreclisis usually occurs as a result of the formation of a blood clot or the narrowing of a blood vessel. It can be a potentially life-threatening condition, which requires immediate medical attention.
Occlusion of the pupil.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.