Where does “xiular” come from?

xiular (Catalan) comes from Latin sībilāre, from Latin sībilus, from Proto-Indo-European sweysd- — to hiss.

xiular (Catalan): to whistle

Definitions

Step	Language	Word	Meaning
1	Latin	sībilāre	—
2	Latin	sībilus	—
3	Proto-Indo-European	sweysd-	to hiss

xiular — Etymology, Origin & Word History | Etymology Explorer