Hypertext Webster Gateway: "rootstock"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Rootstock \Root"stock`\, n. (Bot.)
A perennial underground stem, producing leafly s?ems or
flower stems from year to year; a rhizome.
From WordNet (r) 1.7 (wn)
rootstock
n 1: a horizontal plant stem with shoots above and roots below
serving as a reproductive structure [syn: {rhizome}, {rootstalk}]
2: root or part of a root used for plant propagation;
especially that part of a grafted plant that supplies the
roots
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