Comparative evidence

ǵu̯elh₁, ǵu̯elh₂, ǵu̯elh₃

• OInd. jval- 'burn', 'flame' (Whitney 1885: 57); 'burn brightly', 'blaze', 'glow', 'shine' (MW: 428)

References

MW = Monier-Williams, M. 1899. A Sanskrit-English Dictionary. Clarendon Press.
Whitney 1885 = Whitney W. D. 1885. The roots, verb forms and primary derivatives of the Sanskrit language. A supplement to his Sanskrit grammar. Leipzig.