Comparative evidence

h₂ei̯dʰ

• OInd. indh-/idh- 'kindle' (Whitney 1885: 8); 'light', 'set on fire' (MW: 167)

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.