rheum or Rhe·um
n : a watery discharge from the mucous membranes esp. of the eyes or nose : also : a condition (as a cold) marked by such discharge rheumy adj n : a genus of Asian herbs (family Polygonaceae) that have large leaves, loose stipular sheaths, small flowers in paniculate racemes, and a 3-winged fruit and that include the rhubarbs (as the Chinese rhubarb, R. officinale, and rhapontic, R. rhaponticum) .
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