1. a thin wire or thread-like structure, especially one that glows when heated in an electric light bulb
2. a thin, thread-like part of a plant or animal structure
Usage: biology

Examples

• The light bulb's filament burned out after years of use.
• When you turn on the lamp, the filament heats up and produces light.
• The flower's stamen has a thin filament that supports the anther.
• Incandescent bulbs work by passing electricity through a glowing filament.
• Under the microscope, we could see the delicate filament of the fungus.
• The old-fashioned filament bulbs were warmer but less energy-efficient than LEDs.