filament in Polish:

1. włókno

Polish word "filament"(włókno) occurs in sets:

Ibbotson part 1 (4,5,6,7,8,9,35,36,43,44)
how bad is wind power? REVIEW
5 angielskich słówek codziennie
Cell biology 2
Rozdział 1.3

2. żarnik

Polish word "filament"(żarnik) occurs in sets:

techniczny prezentacje 2
chemia dział 3
Dome / House

3. nitka pręcika

Polish word "filament"(nitka pręcika) occurs in sets:

rosliny drzewo
Parts of the flower

4. drucik

Polish word "filament"(drucik) occurs in sets:

Stephen Hawking: A brief history of time
Technology 1