Noldorin 

dagnir

masculine name. Dagnir

Noldorin [LRI/Dagnir; SM/319; SMI/Dagnir; SMI/Dengar] Group: Eldamo. Published by

Sindarin 

dagnir

masculine name. *Slayer

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).

Sindarin [LBI/Dagnir; SI/Dagnir; WJI/Dagnir] Group: Eldamo. Published by

dagnir

noun. slayer, bane

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”.

Sindarin [PE17/097; S/226; SA/dagor] Group: Eldamo. Published by

dagnir

noun. slayer

Sindarin [S/430] dag-+dîr. Group: SINDICT. Published by

dagnir

noun. bane

Sindarin [S/430] dag-+dîr. Group: SINDICT. Published by

Dagnir Glaurunga

noun. slayer of Glaurung

dag- (“slay”) + (n-)dîr (“man, adult male”, here: “doer”) + Glaurung (dragon-name) + a (Doriathrin genitive ending) #The mutation of dîr to nir might be explained by the Doriathrin origin of the name.

Sindarin [Tolkiendil] Group: Tolkiendil Compound Sindarin Names. Published by

dagnir an glaurung

slayer of Glaurung

Sindarin [PE17/097] Group: Eldamo. Published by

túrin turambar dagnir glaurunga

Túrin Turambar, Glaurung’s Bane

Sindarin [S/226; SA/dagor; SI/Dagnir Glaurunga; UT/145; WJ/103; WJI/Dagnir Glaurunga] Group: Eldamo. Published by

dagnir

Dagnir

The Sindarin name Dagnir means "slayer" (or "bane") from dag + (n)dîr, cf. Dagnir Glaurunga "'Glaurung's Bane".

Sindarin [Tolkien Gateway] Published by

dagnir

bane

(= killer) dagnir (i nagnir, o ndagnir), no distinct pl. form except with article (i ndagnir), coll. pl. dagniriath

dagnir

bane

(i nagnir, o ndagnir), no distinct pl. form except with article (i ndagnir), coll. pl. dagniriath

Quenya 

nehtar

noun. slayer

An element in Morinehtar “Darkness-slayer”, a name of one of the Blue Wizards (PM/384). It seems to be an agental form of nahta- “to slay”, but the reason why the vowel is e is unclear.

nehtar

slayer

#nehtar noun "slayer", isolated from Morinehtar "Darkness-slayer" (PM:384, 385). It may be that a verbal stem #nehta- "to slay, kill" can also be isolated from this noun, though the attested form is actually nahta- (a possible example of A/E variation).