aldarwa
having trees, tree-grown
arwa
in control of, possessing
arwa (1) adj. "in control of, possessing" (followed by genitive, e.g. *arwa collo, "having a cloak [colla]"). Also suffix -arwa"having", as in aldarwa "having trees, tree-grown" (3AR). In a deleted entry in the Etymologies, -arwa was glossed "having, possessing, holding, controlling" (VT45:14)
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
aldarwa
adjective. having trees, tree-grown
A word in The Etymologies of the 1930s glossed “having trees, tree-grown”, a combination of ᴹQ. alda “tree” and the semi-suffix ᴹQ. -arwa “possessing, having”, serving as an example of that suffix’s use (Ety/ƷAR|GAR).
Elements
Word Gloss alda “tree” arwa “possessing, having, in control of”
aldarwa adj "having trees, tree-grown" (3AR). See -arwa.