Rebaba

n. bur

depends whether 'rabab'-lute or 'rababa'-lyre [rebab; term for lutes, both bowed and plucked, and lyres] [rababa:bowl lyre with 5 or 6 strings, similar to the tanbura].

= burr.
Ex: Drypoint was another method of engraving printing plates in the fifteenth century according to which the design was sketched directly on to the plate with a steel point, the burr being left alone.