√THAN root. “kindle, set light to, fire, light”
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.
References ✧ MR/388; PE17/23, 82, 187
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ᴱ√TANA root. “*fire, kindle”
References ✧ GL/69, 71
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