1. the rounded underground part of some plants that stores food and from which new plants grow
2. a glass container that produces light when electricity passes through it
3. any rounded swollen part that resembles a bulb in shape

Examples

• She planted tulip bulbs in the garden last fall.
• The light bulb burned out and needs to be replaced.
• Daffodil bulbs should be planted in autumn.
• He screwed in a new LED bulb to save energy.
• The thermometer has a glass bulb at the bottom.
• Onion bulbs can be stored in a cool, dry place.
• The old incandescent bulb was very hot to touch.