bulb
//bʌlb//
Noun
bulbSingular
bulbsPlural
1
A rounded underground storage organ present in some plants, consisting of a short stem surrounded by fleshy scale leaves or leaf bases, from which new plants can grow.
Plant the tulip bulbs in autumn for spring flowers.
2
A light bulb; a glass globe containing a wire filament or gas that produces light when electricity passes through it.
The bulb in the kitchen needs to be replaced.
3
Any rounded or bulb-shaped part or object, such as the bulb of a thermometer or the olfactory bulb in the brain.
The bulb of the thermometer contains mercury.