The word filament, which is descended from Latin filum meaning "thread", is used in English for a variety of thread-like structures, including: Astronomy Galaxy filament, the largest known cosmic structures in the universe Solar filament, a solar prominence seen against the disc of the sun Biology Myofilament, filaments of myofibrils constructed from proteins Protein filament, a long chain of protein subunits, such as those found in hair or muscle Part of a stamen, the male part of a flower Hypha, a thread-like cell in fungi and Actinobacteria Filamentation, an elongation of individual bacterial cells Textiles Fiber, natural or manmade substances significantly longer than they are wide Yarn (more loosely) Filament fiber, fiber that comes in a continuous long length Media Filament (magazine), a female-oriented erotica magazine 2002 movie by Jinsei Tsuji Filament (band), a musical group from Japan Filament Games, a Wisconsin-based educational video game developer Filament Productions, a production design and touring video company Physics and engineering Electrical filament, in an incandescent light bulb Heater filament, a thin heating element in a vacuum tube Current filament, a current restricted to a small part of the conducting medium Filament propagation, diffractionless propagation of a light beam 3D printing filament, used as raw material in 3D printing See also Monofilament (disambiguation)