Plural of coulter; vertical cutting blades on a plow that cut through soil before the plowshare turns it over.
From Old English culter and Old French coultre, derived from Latin colter. The cutting blade has been essential to plowing since ancient times.
A sharp coulter can make the difference between a farmer breaking their plow on rocky soil and having a successful day—it's why smiths who could sharpen coulters were valuable community members!
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