filament

fil·a·ment

noun \ˈfil-ə-mənt\

Definition of FILAMENT

: a single thread or a thin flexible threadlike object, process, or appendage; especially : an elongated thin series of cells attached one to another or a very long thin cylindrical single cell (as of some algae, fungi, or bacteria)

—fil·a·men·tous \ˌfil-ə-ˈment-əs\ adjective