ᴹ√THOR(ON) root. “come swooping down”
Tolkien used similar Elvish words for “eagle” for much of this life. The first appearance of its root was ᴱ√ŠORO⁽²⁾ “eagle” from the Qenya Lexicon of the 1910s with derivatives like ᴱQ. sorne “eagle” and ᴱQ. sornion “eyrie” (QL/86). Gilson, Hostetter, Wynne and Smith suggested that the Š may represent more ancient Þ, and Gnomish derivatives from the contemporaneous Gnomish Lexicon such as G. thorn “eagle” and G. thrond “eyrie, pinnacle” confirm that the actual early root was *ᴱ√ÞORO (GL/73). In The Etymologies of the 1930s Tolkien gave the root as ᴹ√THOR or ᴹ√THÓRON “come swooping down” with derivatives like ᴹQ. soron/N. thoron “eagle” and N. thôr “swooping, leaping down” (Ety/THOR). In a 1972 letter to Richard Jeffery, Tolkien gave primitive form ✶thorono “eagle” as the basis for Q. sorno/S. thoron, testifying to the enduring nature of this root (Let/427).
References ✧ Ety/THOR; EtyAC/THOR
*ᴱ√ÞORO root. “eagle”
References ✧ LT1A/Sorontur; QL/86