Source : Webster's Revised Unabridged Dictionary (1913)

Filament \Fil"a*ment\, n. [F. filament, fr. L. filum thread. See
   {File} a row.]
   A thread or threadlike object or appendage; a fiber; esp.
   (Bot.), the threadlike part of the stamen supporting the
   anther.

Source : WordNet®

filament
     n 1: a very slender natural or synthetic fiber [syn: {fibril}, {strand}]
     2: the stalk of a stamen
     3: a threadlike anatomical structure or chainlike series of
        cells [syn: {filum}]
     4: a thin wire (usually tungsten) that is heated white hot by
        the passage of an electric current