Quenya 

Ipsin

fine thread

Ipsin noun "fine thread" (PE17:17)

ipsin

noun. fine thread

A word for “fine thread” derived from the root √SPIN- in notes from the mid-1960s (PE17/17).

lia

fine thread, spider filament

lia noun "fine thread, spider filament" (SLIG).

Sindarin 

lhê

fine thread

*lhê (?i thlê or ?i lê the lenition product of lh is uncertain) (spider filament), pl. lhî (?i lî). Suggested Sindarin form of ”Noldorin” thlê.

lhê

fine thread

*lhê (?i thlê or ?i lê the lenition product of lh is uncertain) (spider filament), pl. lhî (?i lî). Suggested Sindarin form of ”Noldorin” thlê. -THREAD, see MIST.