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filament

noun

  1. a very slender thread or fiber
  2. a threadlike part; specif.,
    1. the fine metal wire in a light bulb which becomes incandescent when heated by an electric current
    2. the cathode of a thermionic tube, usually in the form of a wire, which may be electrically heated
  3. Bot. the stalk of a stamen bearing the anther

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See filament in American Heritage Dictionary 4

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filament

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