[root-stok, root-]
Horticulture. a root and its associated growth buds, used as a stock in plant propagation.
Botany. a rhizome.

1930–35; root1 + stock Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rootstock (ˈruːtˌstɒk)
1.  another name for rhizome
2.  another name for stock
3.  biology a basic structure from which offshoots have developed

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
rootstock   (rt'stŏk', rt'-)  Pronunciation Key 
See rhizome.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Advancements in rootstock breeding and selection have revolutionized the manner
  in which apples are grown throughout the world.
Rootstock effects on plant vigor and watermelon fruit quality.
Rootstock resistance to fusarium wilt and effect on fruit yield and quality of
  two muskmelon cultivars.
Long used for cold-hardy rootstock, the trees typically bear pear-shaped or
  oval fruit that ripen in fall.
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