A word for “slayer” (PE17/97), a noun form of dag- “to slay” with the agental suffix -nir, appearing in the (somewhat loosely translated) phrase: Túrin Turambar Dagnir Glaurunga “Túrin Turambar, Glaurung’s Bane” (S/226). I would use this word as “bane” only in the sense of “one who has killed” or “one who will kill”.
Noldorin
dagnir
masculine name. Dagnir
One of the twelve companions of Barahir (S/155). His name seems to be the noun dagnir “slayer” used as a name.
Conceptual Development: In Silmarillion drafts from the 1930s, this character was first named N. Dengar, soon changed to N. Dagnir (SM/319).