Beissker (gender unknown)
NEITHER a bagpipe term, NOR related to any of the other instruments treated in this survey
According to Allmo, who fails to reveal his source, Estonian for Swedish "rör" (reed; tube / pipe); Dubious term, not encountered in other sources.
Allmo, Per-Ulf: Säckpipan i norden: från änglars musik till djävulens blåsbälg (Bagpipes in the nordic countries [From music of the angels to the devil’s bellows]). Stockholm, 1990, p.245.