Definition of coulter
: a cutting tool (as a knife or sharp disc) that is attached to the beam of a plow, makes a vertical cut in the surface, and permits clean separation and effective covering of the soil and materials being turned under
Origin of coulter
Middle English colter, from Old English culter & Old French coltre, both from Latin culter plowshare; akin to Greek skallein to hoe — more at shell
First Known Use: before 12th century
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