filament
fil.a.ment \'fil-*-m*nt\ \.fil-*-'ment-*-re-, -'men-tre-\ \-'ment-*s\ n [MF, fr. ML filamentum, fr. LL filare] : a single thread or a thin flexible threadlike object, process, or append age : as : a tenuous conductor (as of carbon or metal) made incandescent by the pa ssage of an electric current; specif : a cathode in the form of a metal wire in an electron tube : the anther-bearing stalk of a stamen - fil.a.men.ta.ry aj