tambura

from The Collaborative International Dictionary of English v.0.48

Tamboura \Tam*bour"a\, n.
   1. (Mus.) A stringed musical instrument resembling a lute but
      lacking frets, with a small round body and a long neck,
      used to produce an accompaniment for singing; -- called
      also {tambur}, {tambour}, and {tampur}. [Also spelled
      {tambura}.]
      [PJC]