A word for a “canopy” in The Etymologies of the 1930s, a combination of N. dae “shadow” and N. telu “roof” (Ety/TEL; EtyAC/DAY).
Neo-Sindarin: Since Tolkien seems to have later abandoned the meaning “shadow” for N. dae, I would not use this word for “canopy” in Neo-Sindarin, and would use other words like esgal or [N.] orthelian instead.
A noun in The Etymologies of the 1930s glossed “dome, high roof” under the root ᴹ√TEL(U), cognate to ᴹQ. telume “vault, dome (of heaven)” (Ety/TEL).
Conceptual Development: G. telm or telum was glossed “roof; sky” in the Gnomish Lexicon of the 1910s, both derivatives of the root ᴱ√tel- “cover in; close; finish” (GL/70). ᴱN. telum “sky” appeared again in Early Noldorin Word-lists of the 1920s (PE13/153), but by The Etymologies of the 1930s N. telu meant only “dome, high roof” (Ety/TEL), and its connection to “sky” seems to have been abandoned in Noldorin/Sindarin, though retained in Quenya telumë.