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The word Filament, which is descended from Latin filum = "thread", is used in English for a variety of thread-like structures, including:

In physics and electrical engineering[edit]

  • An electrical filament in an incandescent light bulb, when heated using an electric current will emit light, or in hot cathodes of fluorescent lamps to drive the phosphors in the tube to fluoresce and emit light. In vacuum tubes a filament is a source of electrons in directly heated tubes, or the filament is used to heat an electron-emitting electrode in indirect electron emission.
  • Similarly, a thin heating element
  • Current filament
  • Filament propagation, diffractionless propagation of a light beam

In astronomy[edit]

  • Galaxy filament, the largest known cosmic structures in the universe, thread-like structures that form the boundaries between large voids in the universe
  • Solar filament, equivalent to a solar prominence
  • Birkeland current, a specific magnetic field-aligned current in the Earth’s magnetosphere

In biology[edit]

  • Myofilament
  • Protein filament, a long chain of protein subunits, such as those found in hair, muscle, or in flagella
  • Part of a stamen, the male part of a flower
  • A chain of cells connected end-to-end
  • Hypha, a thread-like cell in fungi and Actinobacteria
  • Filamentation, an elongation of individual bacterial cells
  • Fine root hair on plants, natural fibers on plants, and other hair-like growths on plants

Other uses[edit]

See also[edit]