Svirka (f)
original: свирка
tube through which the bag of a mouth-blown bagpipe, &c. is inflated
Blowpipe; Also an actual (notched) flute or whistle; NB: Širola's reference to Kuhač as his source appears to be rather questionable: a) the term doesn't occur in Kuhač's description of the instrument (➺ Puhalica: p.44), and b) even though it (i.e. its accusative form [!]) is mentioned in the article, it definitely doesn't refer to the blowpipe, but (in my perception) more likely to the bagpiper's performance (gajdaševu svirku) ...
Širola, Božidar: Sviraljke s udarnim jezičkom [Aerophones with a beating tongue]. Zagreb, 1937, p.122 (»Kuhač).
Kuhač, Franjo Š. [Šaver]: Prilog za poviest glasbe južnoslovjenske: Gajde [Contribution to the history of South Slavic music: Bagpipes]. In: Rad jugoslavenske akademije znanosti i umjetnosti, knjiga L (Zagreb, 1879), p.67 (svirku).
ws (linguistics [➺ Dictionaries, &c.]).