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root cap

noun
1.
a hollow cone of loosely arranged cells that covers the growing tip of a root and protects it during its passage through the soil
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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root cap in Science
root cap  
A thimble-shaped mass of cells that covers and protects the root tip of plants. Also called calyptra.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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