A word appearing as G. tôdhi {“fringe” >>} “paddock” in the Gnomish Lexicon of the 1910s based on ᴱ√tadh- (GL/71), probably from ancient *tāðī since [ā] became [ō] in Gnomish.

Neo-Sindarin: I would adapt this word as ᴺS. tódhi “paddock” based on the Neo-Root ᴺ√TAD “enclosure”, because while [ā] became [au] in Sindarin, it later become [ō] or [o] in polysyllables. I would assume the final -i was the result of some ancient abstract noun suffix (< *tādiyē), much like in S. serni “pebble bank”.