Filament

Filament may refer to:

In physics and electrical engineering

 * An electrical filament used to emit light in an Incandescent light bulb
 * Similarly, a thin heating element
 * Current filament
 * Filament propagation, diffractionless propagation of a light beam
 * Hot cathode, a filament in a vacuum tube that emits electrons

In astronomy

 * Galaxy filament, the largest known cosmic structures in the universe, thread-like structures that form the boundaries between large voids in the universe
 * Solar filament, equivalent to a solar prominence
 * Birkeland current, a specific magnetic field-aligned current in the Earth’s magnetosphere

In biology

 * Protein filament, a long chain of protein subunits, such as those found in hair, muscle, or in flagella
 * Part of a stamen, the male part of a flower
 * A chain of cells connected end-to-end
 * Hypha, a thread-like cell in fungi and Actinobacteria
 * Filamentation, an elongation of individual bacterial cells

In print

 * Filament (magazine), a female-oriented erotica magazine

Other uses

 * Fiber or yarn
 * Staple (wool), clusters or locks of wool fibers
 * 2002 movie by Jinsei Tsuji
 * Filament (band), a musical group from Japan that consists of Otomo Yoshihide and Sachiko M
 * Filament Games, a Madison, Wisconsin based educational video game developer
 * Filament Productions, a Production Design & Touring Video company based in Charlottesville, Virginia