Thin, thread-like structures, especially the thin wire in a light bulb that glows when heated, or biological structures in living organisms.
From Latin 'filum' meaning thread, with the suffix '-ment' indicating an object or means. The word perfectly describes anything thin, string-like, or thread-like.
Thomas Edison's greatest invention wasn't the light bulb itself, but finding the right filament material—he tested thousands of materials because a filament that burned out in hours was useless; the carbonized bamboo filament lasted 1,200 hours and made electric light finally practical.
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