Definition of filament noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈfɪləmənt//
    ; NAmE NAmE//ˈfɪləmənt//
    Cell biology
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  1. 1a thin wire in a light bulb that produces light when electricity is passed through it
  2. 2(specialist) a long thin piece of something that looks like a thread glass/metal filaments Under the glass cover was a mass of thin wire filaments. The male fish develops extended filaments on the dorsal fin. Underground fungi filaments provide nutrients and water to the trees. See related entries: Cell biology
  3. Word Originlate 16th cent.: from French, or from modern Latin filamentum, from late Latin filare ‘to spin’, from Latin filum ‘thread’.
See the Oxford Advanced American Dictionary entry: filament