ETYM Greek, the mass of roots (of a tree), a stem, race, from rhizos a root: cf. French rhizome.
A horizontal plant stem with shoots above and roots below serving as a reproductive structure; SYN. rootstock, rootstalk.
Root-like stalk or stem of a plant.
Or rootstock; Horizontal underground plant stem. It is a perennating organ in some species, where it is generally thick and fleshy, while in other species it is mainly a means of vegetative reproduction, and is therefore long and slender, with buds all along it that send up new plants. The potato is a rhizome that has two distinct parts, the tuber being the swollen end of a long, cordlike rhizome.

Root or part of a root used for plant propagation; especially that part of a grafted plant that supplies the roots.
Another name for rhizome, an underground plant organ.