G. tum n. “hollow” (Category: Hollow, Concave)
A word appearing as {tûm >>} tum “hollow” in the Gnomish Lexicon of the 1910s, an adjective form of G. {tum} tûm “valley” (GL/71). In Tolkien’s later writings, S. tum was only a noun.
References ✧ GL/71; LT1A/Tombo
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