An unglossed root in The Etymologies of the 1930s with the derivatives ᴹQ. lango “broad sword; prow of a ship” and N. lhang “cutlass, sword” (Ety/LAG), so probably meaning something like “✱cut”.
Middle Primitive Elvish
ris
root. slash, rip
risse-
noun. a ravine
rista-
verb. cut
kiris
root. cut
rō/oro
root. rise, up, high
oro
root. rise, up, high
orta-
verb. to rise
am
root. up
ortā-
verb. to raise
srō
root. east
lag
root. *cut
lisge
noun. reed
nyol
root. ring
tārī
noun. queen
A root appearing in a rejected page of roots from the Quenya Verbal System of the 1940s (PE22/127), possibly as a variant of √RŌ/ORO that Tolkien introduced to explain S. rhûn “east” after he decided initial r- did not become rh- in Noldorin/Sindarin; see the entry on S. rhûn for discussion.