colter

noun
col·​ter
variants: or less commonly coulter \ ˈkōltə(r) \
plural -s

Definition of colter 

: a knife, sharp disc, or other cutting tool that is attached to the beam of a plow to cut the sward in advance of the plowshare and moldboard

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History and Etymology for colter

Middle English colter, from Old English culter & Old French coltre, both from Latin culter plowshare, knife; akin to Old High German scala husk, Old Norse skilja to separate, Gothic skilja butcher, Greek skalis hoe, mattock, Lithuanian skélti to split

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