coulter

noun

coul·​ter ˈkōl-tər 

: a cutting tool (such 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

Word History

Etymology

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 the 12th century, in the meaning defined above