Webster's English Dictionary

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rhubarb

rhu.barb \'ru:-.ba:rb\ n [ME rubarbe, fr. MF reubarbe, fr. ML reubarbarum, 
   alter. of (Xrha barbarum, lit., barbarian rhubarb 1: any of several plants 
   (genus Rheum) of the buckwheat family having  large leaves with thick 
   succulent petioles often used as food 2: the dried rhizome and roots of any 
   of several rhubarbs grown in China an d Tibet and used as a purgative and 
   stomachic bitter 3: a heated dispute or controversy