Someone, or those, who study crop circles or circles that are seen in wheat fields: "The circles, or hundreds of huge geometrical patterns in the middle of English wheat fields, appeared like magic in the middle of the night and created a new term known as cereologist."

"In fact, cereologists devoted books to the wheat-field wonders, and curious tourists flocked to see them; until September 1991, when two 60-something artists came forward to show how they had created the circles at night with lengths of rope and flat boards."