A noun attested as the isolated word dolgu, described as “a word with the evil sense of ‘night’ or ‘dark’” (SD/306). It may be related to S. dû “night” and N. doll “obscure, hidden, dusky”, as suggested by Carl Hostetter and Patrick Wynn (AAD/13). It is similar to the word dulgu “black” appearing in the Lament of Akallabêth and the two may be variations of the same word, but most authors have suggested (AAD/13-14, AL/Adûnaic, EotAL/DUL’G, NBA/11, 24) that they are distinct words. In the phonetic rules in Lowdham’s Report from this period, a short o cannot appear in an Adûnaic (SD/423), so perhaps the proper form of this noun should be *dôlgu.
dolgunoun. dark, (evil) night