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A crop, such as winter rye or clover, planted between periods of regular crop production to prevent erosion and typically turned under before maturity to increase the soil's organic matter and nitrogen content.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Agriculture) a crop planted between main crops to prevent leaching or soil erosion or to provide green manure
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a crop, usu. a legume, planted to keep nutrients from leaching, soil from eroding, and land from weeding over, as during the winter.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.