Keraulis (m)
(with) definite article: ooriginal: κεραύλης (ὁ)
any person who plays some kind of bagpipe (&c.)
Van der Meer, who fails to reveal his source, suggests a relation with "a possible horn bell of the longer pipe", omitting, however, to give a translation of the term itself, thus risking to leave the reader, who may not be familiar with the Greek language, confused.
Baines, Anthony: Bagpipes [1960]. Oxford, 1973 (revised), p.57.
Meer, John Henry van der: Typologie der Sackpfeife. In: Anz. Germ. Nationalmus. (Nürnberg, 1964), p.128.