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perisperm

 - 2 dictionary results
per·i·sperm   (pěr'ĭ-spûrm')   
n.   Botany
The nutritive tissue that is derived from the nucleus and surrounds the embryo of the seed.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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perisperm

noun
the nutritive tissue outside the sac containing the embryo in some seeds 
WordNet® 3.0, © 2006 by Princeton University.
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