A noun in the Gnomish Lexicon of the 1910s given as the cognate of G. goloth “forest”, derived from primitive ᴱ✶ŋgua-aloþ- (GL/41). This is likely a combination of ᴱ✶ŋu̯a “together” and some elaboration of the root ᴱ√ALA “spread”, the basis of “tree” words, so probably originally “✱together spread(ing)” or something to that effect.
Early Quenya
almo
noun. shoulder(s), back
aldamo
noun. shoulder(s), back
málos
noun. forest
taure
noun. forest
taurie
noun. forest
The word ᴱQ. almo or aldamo “back, shoulders” appeared in the Qenya Lexicon of the 1910s under the early root ᴱ√ALA “spread”, and the longer form was an element in the name ᴱQ. Aikaldamor “Broad Back” (QL/29). This pair of words (along with deleted {alma}) reappeared in Early Qenya Word-lists of the 1920s, but there they had the gloss “shoulder” (PE16/144).
Neo-Quenya: The early root ᴱ√ALA “spread‽” was the basis for ᴱQ. alda “tree”, which in later writings was derived from ✶galadā. Thus ᴺQ. almo “shoulder” might be retained as a derivative of the later form of the root: √GAL. The sense of the later root was “grow (like plants), flourish” rather than “spread”, so this is a bit of a reach semantically, though not impossible since ✶galadā referred to broad, spreading trees as opposed to ✶ornē for tall trees (NM/349). I would use ᴺQ. almo only for “shoulder”; for “back” I recommend the neologism ᴺQ. catta.