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In agriculture, a plowshare (US; ) or ploughshare (UK; ) is a component of a plow (or plough). It is the cutting or leading edge of a moldboard which closely follows the coulter (one or more ground-breaking spikes) when plowing. The plowshare itself is often a hardened blade dressed into an integral moldboard (by the blacksmith) so making a unified combination of plowshare and moldboard, the whole being responsible for entering the cleft in the earth (made by the coulter's first cutting-through) and turning the earth over. In well-tilled terrain the plowshare may do duty without a preceding coulter. In modern plows both coulter and plowshare are detachable for easy replacement when worn or broken. == Plowshares in heraldry == Plowshares are often used in heraldry. File:Coa_de-by-erding.svg|Arms of Erding File:Wappen Tunau.png|Arms of Tunau File:Wappen Leuna.svg|Arms of Leuna File:Wappen erlbach.png|Arms of Erlbach File:Wappen Neuler.svg|Arms of Neuler 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Plowshare」の詳細全文を読む スポンサード リンク
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