One of the mysteries of the English language finally explained.
(attributive) designating a method of crop irrigation in which a long wheel-mounted pipe with downward-facing sprinklers along its length slowly rotates around a central well, watering a circular area typically half a mile in diameter; making use of this method.
An irrigation unit or system which makes use of this method.
1960s; earliest use found in Beatrice (Nebraska) Daily Sun.
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