Meaning & Definition of Bulb in English

1. A modified bud consisting of a thickened globular underground stem serving as a reproductive structure

2. Electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity

3. A rounded part of a cylindrical instrument (usually at one end)

• "The bulb of a syringe"

4. Anything with a round shape resembling a teardrop

5. Lower or hindmost part of the brain

• Continuous with spinal cord

• (`bulb' is an old term for medulla oblongata)

• "The medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning"

6. A rounded dilation or expansion in a canal or vessel or organ