A word appearing as G. fathrin “tasselled” in the Gnomish Lexicon of the 1910s, an adjectival form of G. fath/fass “tassel” (GL/34). There was a similar adjective G. fathwed “tasselled” written above it.

Neo-Sindarin: I’d adapt this word as ᴺS. fathren “tasselled” for purposes of Neo-Sindarin based on ᴺS. fass “tassel”, where ancient sr become thr.