The Proto-Indo-European word *wel-
Word *wel-
Meaning turn, wind, roll
See also Proto-Indo-European: *welutrom ‘case’
Ancient Macedonian: ἴλη ‘millitary term’
Synonyms *h₂weh₁-nt-, *derbʰ-, *kleng-, *trep-, *weig/k-, *weip-~weib-, *wert-, *seu-, *slenk-, *(s)neh₁-

Comments
Mallory J.P. and Adams D. (2006)

Other words that might be of interest
*tón-r̥- ‘thunder’, *ghromos ‘thunder, groan’, *(s)tenhₓ- ‘groan, thunder’