a thin wire in a light bulb that produces light when electricity is passed through it （电灯泡的）灯丝；丝极 - (specialist)
a long thin piece of something that looks like a thread 细丝；丝状物 glass/metal filaments 玻璃丝；金属丝 Under the glass cover was a mass of thin wire filaments. 玻璃罩下是一团细丝。 The male fish develops extended filaments on the dorsal fin. 雄鱼在背鳍上长出延伸的细丝。 Underground fungi filaments provide nutrients and water to the trees. 地下真菌丝为树木提供养分和水分。
Word Originlate 16th cent.: from French, or from modern Latin filamentum, from late Latin filare ‘to spin’, from Latin filum ‘thread’.