A noun in The Etymologies of the 1930s given as N. {heðw >>} hithw “fog” derived from primitive ᴹ✶khithme under the root ᴹ√KHITH “mist, fog” (Ety/KHIS; EtyAC/KHIS).
Conceptual Development: G. huith “fog” from the Gnomish Lexicon of the 1910s is a likely precursor (GL/49), perhaps derived from a (hypothetical) early root ✱ᴱ√HUYU.
Neo-Sindarin: If adapted to Neo-Sindarin, this word would become ᴺS. hithu, as suggested in HSD (HSD).
A word in The Etymologies of the 1930s glossed “white fog, wet mist” derived from the root ᴹ√MITH (Ety/MITH). As a later addition to this entry, Tolkien instead gave N. mith “grey”, and that was how this word was typically used in Tolkien’s later writings.