mold board

moldboard

[mohld-bawrd, -bohrd]
noun
1.
the curved metal plate in a plow that turns over the earth from the furrow.
2.
a large blade mounted on the front of a bulldozer to push loose earth.
3.
a board forming one side or surface of a mold for concrete.

Origin:
1300–50; replacing earlier moldbred, Middle English mold bred. See mold3 (defs 1 and 2), mold1 (def 3), board

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
moldboard (ˈməʊldˌbɔːd)
 
n
the US spelling of mouldboard

Collins English Dictionary - Complete & Unabridged 10th Edition
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