Rheic \Rhe"ic\, a. [NL. Rheum rhubarb, Gr. ??? See Rhubarb.]

(Chem.) Pertaining to, or designating, an acid (commonly called chrysophanic acid) found in rhubarb (Rheum). [Obsoles.]

Source: Webster's Revised Unabridged Dictionary (1913)
 

Rheum \Rhe"um\ (r[=e]"[u^]m), n. [NL., from L. Rha the river Volga, on the banks of which it grows. See Rhubarb.]

(Bot.) A genus of plants. See Rhubarb.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Rheum \Rheum\ (r[udd]m), n. [OF. reume, rheume, F. rhume a cold,, L. rheuma rheum, from Gr. ???, fr. "rei^n to flow, akin to E. stream. See Stream, n., and cf. Hemorrhoids.]

(Med.) A serous or mucous discharge, especially one from the eves or nose.

I have a rheum in mine eyes too. --Shak.

Salt rheum. (Med.) See Salt rheum, in the Vocab.

Source: Webster's Revised Unabridged Dictionary (1913)
 

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 Polygonace[ae].

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.

3. (Med.) The root of several species of Rheum, used much as a cathartic medicine.

Monk's rhubarb. (Bot.) See under Monk.

Turkey rhubarb (Med.), the roots of Rheum Emodi.

Source: Webster's Revised Unabridged Dictionary (1913)