An adjective in The Etymologies of the 1930s given as {tlaud >>} N. atlaud > aclod “sloping, tilted”, a derivative of the root ᴹ√TALAT “to slope, lean, tip” (Ety/TALÁT). In The Etymologies as published in The Lost Road it was given as atland, but this was corrected to atlaud > aclod by Carl Hostetter and Patrick Wynne (EtyAC/TALÁT). The change tl > cl was normal in the Noldorin period, but it is not clear why the consonant did not undergo mutation to gl, such as with ON. etlenna > N. eglenn (Ety/LED). The unaugmented form tlaud “sloping” < ON. tlāta appeared in the first version of Tengwesta Qenderinwa (TQ1), also from the 1930s (PE18/38).
Neo-Sindarin: If you use this word for Neo-Sindarin, it would probably be best to reform it to ᴺS. adlod.
Correction from: discord.com