From A Word A Day:

Cereologist (seer-ee-OL-uh-jist)

noun

One who specializes in investigating crop circles.

Going by the countless varieties of cereals on the supermarket shelves, you'd think you have to be a cereologist to be able to select one. But it's not that. Rather, a cereologist is someone who studies crop circles, intricate circular patterns on crop fields.

The word is coined after Ceres, the goddess of agriculture in Roman mythology.