Definition from Wiktionary, the free dictionary
rootstock (plural rootstocks)
- (agriculture) A healthy plant that is used as the base for grafting a scion
- (by extension) The necessary basis for something to develop
2009 January 30, Simon Jenkins, “For real secrets we already have the one-and-a-half-year memoir rule”, The Guardian:
- We know more - vastly more - about how we are governed, and that knowledge is the rootstock of consent.
a healthy plant used as the base for grafting