the thick reddish or green leaf stalks of a cultivated plant of the dock family, which are eaten as a fruit after cooking

rhubarb pie

the large-leaved Eurasian plant which produces rhubarb

the noise made by a group of actors to give the impression of indistinct background conversation, especially by the random repetition of the word ‘rhubarb’

a heated dispute

rhubarbs often broke out among these less than professional players