Rootstock definition

ro͝otstŏk, ro͝ot-
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A root system of a plant, often with a portion of the stem, to which a shoot or bud is grafted.
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(zool.) The rootlike, attached portion of a hydroid colony.
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A plant onto which another is grafted as a new top.
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(agriculture) A healthy plant that is used as the base for grafting a scion.
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(by extension) The necessary basis for something to develop.
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Other Word Forms

Noun

Singular:
rootstock
Plural:
rootstocks

Origin of rootstock