G. thith n. “dust” (Category: Dust, Powder)
A noun in the Gnomish Lexicon of the 1910s glossed “dust”, appearing below other forms like G. thisin “parched, withered” (GL/73). The latter is clearly a cognate of ᴱQ. sisin from the contemporaneous Qenya Lexicon, and hence is derived from the root ᴱ√SISI as it appeared in that document (QL/84), though its Gnomish derivatives make it clear the actual root was *ᴱ√ÞISI.
References ✧ GL/39, 73