/'ru:bɑ:b; `rubɑrb/
n [U]
1 (garden plant with) fleshy reddish leaf-stalks that are cooked and eaten like fruit 大黄; 大黄茎
*[attrib 作定语] rhubarb pie 大黄馅饼.
2 (infml 口) (word that crowd actors repeat to simulate the babble of voices on stage 为制造人声嘈杂的舞台效果, 群众演员反复说的道白).

n[U]
[Date: 1300-1400; Language: Old French;Origin: reubarbe, from Medieval Latin reubarbarum, from rha 'rhubarb' (from Greek) + barbarus 'foreign']
a plant with broad leaves. It has thick red stems that can be cooked and eaten.
spoken a word repeated by actors to make a sound like many people talking