Tolkien himself was uncertain on the interpretation of the Dwarvish name Azanulbizar. He suggested that it probably derived from azan 'dimness, shadows', ul 'of' and bizār 'small streams'. Hence the entire name can be interpreted as the 'rills of the shadows' or the 'shadowed streams'.
The name is thus very close in meaning to the Elvish equivalent, Nanduhirion, which meant 'valley of dim streams' (and the Common Speech name, which is given in English as the 'Dimrill Dale'). Notably both the Elvish and Common Speech names include a word for 'valley', which is missing from Azanulbizar. Tolkien addresses this in his notes on the name, suggesting that the full name (which is never actually used in his tales) would have incorporated duban 'valley' to form Duban Azanulbizar.
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