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a filament of solar material
a glowing light bulb filament


From Medieval Latin filamentum, from Late Latin filare ‎(to spin, draw out in a long line), from Latin filum ‎(thread)


filament ‎(plural filaments)

  1. A fine thread or wire.
  2. Such a wire, as can be heated until it glows, in an incandescent light bulb or a thermionic valve.
  3. (physics, astronomy) A massive, thread-like structure, such as those gaseous ones which extend outward from the surface of the sun, or such as those (much larger) ones which form the boundaries between large voids in the universe.
    solar filament
    galaxy filament
    the Ursa Major Filament
  4. (botany) The stalk of a stamen in a flower, supporting the anther.
  5. (textiles) A continuous object, limited in length only by its spool, and not cut to length.