3 occurrences in 3 dictionaries
Reference: Coulter
Easton
(1Sa 13:20-21), an agricultural instrument, elsewhere called "ploughshare" (Isa 2:4; Mic 4:3; Joe 3:10). It was the facing-piece of a plough, analogous to the modern coulter.
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Hastings
Only 1Sa 13:20 f. for the word elsewhere rendered 'plow-share,' and so it should be here, as the Hebrew plough, like its Syrian representative to-day, had no coulter. See Agriculture,
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Morish
eth. An agricultural instrument that needed sharpening; some suppose that the word signifies a ploughshare; others, a mattock, 1Sa 13:20-21.