Primitive elvish
than
root. kindle, set light to, fire, light
thandā
noun. shield
artaurē
noun. Realm
kirissi
noun. cleft
ndorē
noun. land
ndōro
noun. land
stona
noun. pine
thŏno
noun. pine
than
root. kindle, set light to, fire, light
thandā
noun. shield
artaurē
noun. Realm
kirissi
noun. cleft
ndorē
noun. land
ndōro
noun. land
stona
noun. pine
thŏno
noun. pine
Tolkien used this root primarily to explain the name S. Gilthoniel “Star-kindler”. In a 1955 letter to David Masson, Tolkien gave √THAN “kindle” as the basis for the perfect participle S. thoniel “kindler”, in contrast to S. thôn < ✶stŏna (PE17/82). In Words, Phrases and Passages in the Lord of the Rings from the late 1950s or early 1960s, Tolkien gave {√TON >> √TÁN >>} √THĂN/THĀN as the basis for the same name, but with the suffix S. -iel being a feminine suffix (PE17/23; MR/388).
The root √THAN from the 1950s might be a restoration of the unglossed root ᴱ√tan- from the Gnomish Lexicon of the 1910s with derivatives like G. tan “firewood” and G. tantha- “set light to, kindle” (GL/69), along with other forms like G. tôn “fire (on a hearth)” and G. tortha- “scorch” (GL/71). This may be reflected in the deleted forms in the aforementioned note: {√TON >> √TÁN >>} √THĂN/THĀN.