N. nartha- v. “to kindle” (Category: to Light, Kindle)
A verb in The Etymologies of the 1930s for “kindle” given in the Noldorin infinitive form nartho and derived from the root ᴹ√NARTA of the same meaning (EtyAC/NARTA). This root is probably just a causative verb formation from ᴹ√NAR¹ “flame, fire”, and thus more literally “*make fire”. Hence I think this verb can be used in the general sense of “*ignite, inflame, set fire to”, etc.
References ✧ EtyAC/NARTA
|ᴹ√NARTA > nartho||[narta-] > [nartʰa-] > [narθa-]||✧ EtyAC/NARTA|