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A layer of nutritive tissue in the seed of certain flowering plants that is derived from the nucellus and surrounds the embryo.
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.
(Botany) the nutritive tissue surrounding the embryo in certain seeds, and developing from the nucellus of the ovule
ˌperiˈspermal, ˌperiˈspermic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014