rootstock Syllabification: (root·stock)Pronunciation: /ˈro͞otˌstäk, ˈro͝ot-/Definition of rootstock noun a rhizome. a plant onto which another variety is grafted. a primary form or source from which offshoots have arisen:the rootstock of all post-Triassic ammonitesrootstock in other Oxford dictionaries Definition of rootstock in the British & World English dictionary
