Raboin or Rabuino (French)
. The devil; so called from the Spanish rubo (a tail). In the mediæval ages it was vulgarly asserted that the Jews were born with tails; this arose from a confusion of the word rabbi or rabbins with raboin or rabuino.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.