An unglossed root in The Etymologies of the 1930s with derivatives like ᴹQ. tuo/N. tû “muscle, sinew; vigour, physical strength” and ᴹQ. tunga/N. tong “taut, tight (of strings, resonant)” (Ety/TUG). It was also the basis for the name N. Tuor “strength-vigour”, the only place where this name was given a clear etymology, though later Tolkien decided this name was actually from the language of the Edain (PM/348, 364 note #49).
- ᴹ✶tū “strength” ✧ Ety/TUG
- ᴹ✶tūgu “muscle, sinew; vigour, physical strength” ✧ Ety/TUG
- ᴹ✶tungā “taut, tight; resonant (of strings)” ✧ Ety/TUG
- ᴹ✶Tūgore “strength-vigour” ✧ Ety/GOR
A rejected root in The Etymologies of the 1930s glossed “dig” (Ety/DAG), it may have been a transient replacement for √SAP.