RhymeZone: rubarb definitions

Definitions of rubarb:

noun: Obsolete spelling of rhubarb [Any plant of the genus Rheum, especially Rheum rhabarbarum, having large leaves and long green or reddish acidic leafstalks that are edible, in particular when cooked (although the leaves are mildly poisonous).]

(Definitions from Wiktionary)