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Noun: disc plow
Usage: N. Amer (elsewhere: disc plough)
  1. A plow that consists of a gang of concave steel cutting disks, used for work in hard dry soils
    "The farmer used a disc plow to break up the compacted soil";
    - disc plough [Brit]

Type of: moldboard plow [N. Amer], mouldboard plough [Brit, Cdn]