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English definition of “filament”

filament

noun [C] uk   /ˈfɪl.ə.mənt/ us  
a thin thread or fibre of natural or artificial material: Toothbrushes should be replaced when the filaments become worn. glass/silk filaments a thin wire, especially one that lights up inside an electric light bulb: a tungsten filament
(Definition of filament from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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