rub-a-dub ( synonym found)
Definition of rub-a-dub:

°Any plant of the genus Rheum, especially R. rharbarbarum, having large leaves and long green or reddish acidic leafstalks, that are edible, in particular when cooked (although the leaves are mildly poisonous).
°The dried rhizome and roots of R. palmatum or R. officinale, from China, used as a laxative and purgative.
Definition of rub-a-dub:

°Any plant of the genus Rheum, especially R. rharbarbarum, having large leaves and long green or reddish acidic leafstalks, that are edible, in particular when cooked (although the leaves are mildly poisonous).
°The dried rhizome and roots of R. palmatum or R. officinale, from China, used as a laxative and purgative.
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