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barre,
also bar (bär)

[French, from Old French, from Vulgar Latin* barra, of Gaulish origin.]

noun 

  1. A handrail fixed to a wall, as in a dance studio, used by ballet dancers as a support in certain exercises.
  2. A fingering technique used with fretted stringed instruments in which a finger is laid across the fretboard to stop all or several strings at once.