/ ˈruːbɑːb; NAmE -bɑːrb/ noun [ U ]
1.
the thick red stems of a garden plant, also called rhubarb , that are cooked and eaten as a fruit :
rhubarb pie
2.
a word that a group of actors repeat on stage to give the impression of a lot of people talking at the same time
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WORD ORIGIN
late Middle English : from Old French reubarbe , from a shortening of medieval Latin rheubarbarum , alteration (by association with rheum rhubarb) of rhabarbarum foreign rhubarb, from Greek rha (also meaning rhubarb) + barbaros foreign.