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(Science: botany) A genus of plants. See rhubarb.

Origin: NL, from L. Rha the river Volga, on the banks of which it grows. See Rhubarb.

(Science: medicine) A serous or mucous discharge, especially one from the eves or nose. I have a rheum in mine eyes too. (Shak) salt rheum.

(Science: medicine) See salt rheum, in the Vocab.

Origin: OF. Reume, rheume, F. Rhume a cold, L. Rheuma rheum, from Gr, fr. To flow, akin to E. Stream. See Stream, and cf. Haemorrhoids.