Definition of "moldboard" []

• The curved plate of a plow that turns over the soil. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Then, as now, farmers used a long curved blade called a moldboard to turn over the earth, exposing nutrients and getting rid of grass, stubble and weeds on the surface."
• "I do not know of such a machine in use, nor do I believe in the theory of Dr. Brainard, that the moldboard is the only plan for properly pulverizing the soil; for I am satisfied that such plan is wholly inadmissible in steam plowing in this country, for want of sufficient traction for self-propulsion, and observation has taught me that a self-propelling plow is the only steam plow our people will tolerate."
• "Meanwhile, the moldboard plow, invented in China in the 2nd Century, did not appear in Europe until the 17th Century as an import, after which European agriculture became phenomenally more efficient."