disk-harrow

disk harrow

noun
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.

Origin:
1880–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
disk harrow

noun
a harrow with a series of disks set on edge at an angle 
WordNet® 3.0, © 2006 by Princeton University.
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