A root in The Etymologies of the 1930s glossed “height, mountain” given as an extension of ᴹ√ORO “up, rise, high”, with derivatives like ᴹQ. oron (oront-) “mountain” and N. orod “mountain” (Ety/ÓROT). The latter dates all the way back to G. orod “mountain” from the Gnomish Lexicon of the 1910s (GL/63), and continued to be used in later writings as S. orod as well (e.g. on LotR/469). The derivatives of the root on the Qenya side were more variable, sometimes given as Q. orto (PE17/64) or orot- (VT47/28) instead.
Middle Primitive Elvish
oro
root. rise, up, high
orǭmē
masculine name. Orǭmē
oron
root. high tree
orot
root. height, mountain
orok
root. *goblin
rō/oro
root. rise, up, high
doron
root. oak
srō
root. east
orta-
verb. to rise
ortā-
verb. to raise
(o)rom
root. loud noise, horn blast
galadā
noun. tree
am
root. up
galad
root. tree
The basis for Elvish “tree” words, this root first appeared in The Etymologies of the 1930s as an extension of ᴹ√GALA “thrive” (Ety/GALAD). This replaced the earliest derivation of “tree” from the Qenya Lexicon of the 1910s, where the Qenya word for “tree” ᴱQ. alda was derived from ᴱ√ALA “spread” (QL/29). In The Etymologies, the Quenya form of this word remained the same, but the 1910s Gnomish words G. âl “wood” and †alwen “tree” (GL/19) became the 1930s Noldorin word N. galadh “tree” (Ety/GALA). Quenya and Sindarin retained these words for “tree” thereafter, and while Tolkien did not mention the root √GALAD again, his continued use of primitive ✶galadā “tree” (Let/426; PE17/153; PE21/74; UT/266) made it clear this root remained valid.
pheleg
root. cave
rǭda
noun. cave
stal
root. steep
A root in The Etymologies of the 1930s glossed “steep” with derivatives like Ilk. thall “steep, falling steeply (of river)” and Ilk. thalos “torrent”, the latter used for the river name Ilk. Thalos (Ety/STAL). Tolkien continued to use the name S. Thalos in later versions of The Silmarillion, but the name was translated nowhere else, making its continued connection to the 1930s root uncertain.
tussā
noun. bush
A root mentioned in several places in The Etymologies of the 1930s: as {ᴹ√ORÓN >>} ᴹ√ÓRON under the entry for ᴹ√NEL (EtyAC/NEL) and as {ᴹ√ÓR-ON >>} ᴹ√ÓR-NI “high tree” under the entry for ᴹ√ORO “up, rise”, an extension of that root (Ety/ORO; EtyAC/ORO). In the latter entry ᴹ√ÓR-NI was the basis for ᴹQ. orne/N. orn “(high isolated) tree”. The root itself does not appear in Tolkien’s earliest writings, but G. orn “tree” dates all the way back to the Gnomish Lexicon of the 1910s, though there its Qenya cognate was ᴱQ. orond- “bush” (GL/62). The primitive form ᴱ✶orne- appeared in the Noldorin Dictionary from the 1920s with derivatives ᴱQ. orne/ᴱN. orn “tree” (PE13/164), and primitive ✶ornē continued to appear in Tolkien’s writings in the 1940s, 50s and 60s (SD/302; PE17/113; UT/266), its last mentioned being in a 1972 letter to Richard Jeffery, where it was again given as an extension of √OR/RO (Let/426). It was thus a very enduring idea.