filament filament /ˈfɪləmənt/

noun

1. A thin wire (usually tungsten) that is heated white hot by the passage of an electric current  ( filament )
   a thin wire (usually tungsten) that is heated white hot by the passage of an electric current
    The filament in an incandescent light bulb produces light when heated by an electric current
   The filament in an incandescent light bulb produces light when heated by an electric current
   
   
2. A threadlike structure (as a chainlike series of cells)  ( filament , filum )
   a threadlike structure (as a chainlike series of cells)
   
3. The stalk of a stamen  ( filament )
   the stalk of a stamen
   
4. A very slender natural or synthetic fiber  ( fibril , filament , strand )
   a very slender natural or synthetic fiber