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The Collaborative International Dictionary of English v.0.48 (gcide)

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}.
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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.
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I have a rheum in mine eyes too. --Shak.
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{Salt rheum}. (Med.) See {Salt rheum}, in the Vocabulary.
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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}.
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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}.
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3. (Med.) The root of several species of {Rheum}, used much
as a cathartic medicine.
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{Monk's rhubarb}. (Bot.) See under {Monk}.

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