'Rheum Rhaponticum' definitions:

Definition of 'Rheum rhaponticum'

noun

Long cultivated hybrid of Rheum palmatum; stems often cooked in pies or as sauce or preserves [syn: pie plant, garden rhubarb, Rheum cultorum, Rheum rhabarbarum, Rheum rhaponticum]

From: GCIDE

Rhubarb \Rhu"barb\, n. [F. rhubarbe, OF. rubarbe, rheubarbe, reubarbare, reobarbe, LL. rheubarbarum for rheum barbarum, Gr. ??? (and ??) rhubarb, from the river Rha (the Volga) on whose banks it grew. Originally, therefore, it was the barbarian plant from the Rha. Cf. Barbarous, Rhaponticine.]
1. (Bot.) The name of several large perennial herbs of the genus Rheum and order Polygonaceae. [1913 Webster]
2. The large and fleshy leafstalks of Rheum Rhaponticum and other species of the same genus. They are pleasantly acid, and are used in cookery. Called also pieplant. [1913 Webster]
3. (Med.) The root of several species of Rheum, used much as a cathartic medicine. [1913 Webster]
Monk's rhubarb. (Bot.) See under Monk.
Turkey rhubarb (Med.), the roots of Rheum Emodi. [1913 Webster]

From: GCIDE

Pieplant \Pie"plant`\, n. (Bot.) A plant (Rheum Rhaponticum) the leafstalks of which are acid, and are used in making pies; the garden rhubarb. [1913 Webster] Piepoudre