Plow share

plowshare

[plou-shair]
noun
the cutting part of the moldboard of a plow; share.

Origin:
1350–1400; Middle English plowghschare. See plow, share2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
plowshare

noun
a sharp steel wedge that cuts loose the top layer of soil 
WordNet® 3.0, © 2006 by Princeton University.
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