Read the dictionary definition of bulb. All definitions for this word.
1. a rounded part of a cylindrical instrument (usually at one end)
1. the bulb of a syringe
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 dilation or expansion in a canal or vessel or organ
4. lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
1. the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning
5. a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
6. anything with a round shape resembling a teardrop