ᴹ√NARTA root. “kindle”
A root in The Etymologies of the 1930s glossed “kindle”, with derivatives ᴹQ. narta- and N. nartha- of the same meaning (EtyAC/NARTA). There is a mark above the final A that might be a partially formed macron (NARTĀ), so this “root” may just be an ordinary causative verb “*make fire” = ᴹ√NAR¹ + ᴹ✶-tā. The root was originally glossed “spear point, gore, triangle” with a derivative [N.] Narthas “gore”, a name that appeared in Lord of the Rings drafts but was eventually replaced by N./S. Naith “angle” (TI/244 note #50).
References ✧ EtyAC/NARTA