One of the mysteries of the English language finally explained.
1Passing through a series of terms or objects as if arranged in a circle, so that one passes from the last immediately to the first again. rare.
2Medicine. Relating to or designating a form of nystagmus that occurs during, and in the direction of, rotation of the body.
Mid 19th century; earliest use found in Proceedings of the Royal Society of London. From per- + rotatory.
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