G. mûst n. “byre, cowhouse” (Category: Cow)
A word appearing as G. mûst “byre, cowhouse” in the Gnomish Lexicon of the 1910s, a combination of G. mû “ox” and ost “enclosure” (GL/58). Tolkien wrote ŭ in parenthesis after this word, perhaps indicating the proper form should be mŭst, since a long vowel before a cluster like st is very peculiar.
Reference ✧ GL/58 ✧ “byre, cowhouse”
|ost¹||“enclosure, yard; town”||✧ GL/58|