[{"Bold_text": "noun", "List Items": ["any of several plants belonging to the genus Rheum,of the buckwheat family, as R. officinale,having a medicinal rhizome, and R. rhabarbarum,having edible leafstalks.", "the rhizome of any medicinal species of this plant, forming a combined cathartic and astringent.", "the edible, fleshy leafstalks of R. rhabarbarum,used in making pies, preserves, etc.", "Slang.a quarrel or squabble."]}]