bulb ( bulbs plural )
1 n-count A bulb is the glass part of an electric lamp, which gives out light when electricity passes through it.
The stairwell was lit by a single bulb.
2 n-count A bulb is a root shaped like an onion that grows into a flower or plant. ...tulip bulbs.
light bulb ( light bulbs plural ) A light bulb or bulb is the round glass part of an electric light or lamp which light shines from. n-count
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