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moldboard

[mohld-bawrd, -bohrd] /ˈmoʊldˌbɔrd, -ˌboʊrd/
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 of moldboard
1300-1350
1300-50; replacing earlier moldbred, Middle English mold bred. See mold3 (for defs 1, 2), mold1 (for def 3), board
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for moldboard

moldboard

/ˈməʊldˌbɔːd/
noun
1.
the US spelling of mouldboard

mouldboard

/ˈməʊldˌbɔːd/
noun
1.
the curved blade of a plough, which turns over the furrow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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