Crop circles in a field.
The definition of a crop circle is a large, sometimes circular pattern created by the flattening of a crop in the fields, created by natural or supernatural causes.
An example of a crop circle is the pattern found in crops across southern England in the 1970s.
any large, usually circular, pattern formed typically on farmland by the bending or crushing of upright crops and variously attributed to geological forces, alien spacecraft, hoaxers, etc.
A usually circular pattern or group of patterns occurring in a field as the result of the flattening of the stems of grain or other crops, often as a prank to claim extraterrestrial or paranormal origin.