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disk harrow

noun
  1. a harrow having a number of sharp-edged, concave disks set at such an angle that as the harrow is drawn along the ground they turn the soil, pulverize it, and destroy weeds.
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Origin of disk harrow

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018