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CoulterEASTON'S
(1 Sam. 13:20, 21), an agricultural instrument, elsewhere called “ploughshare” (Isa. 2:4; Micah 4:3; Joel 3:10). It was the facing-piece of a plough, analogous to the modern coulter.
Easton's Illustrated Bible Dictionary, 3rd ed. (1897), public domain.