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Definition of light bulb noun from the Oxford Advanced Learner's Dictionary

light bulb

noun
 
/ˈlaɪt bʌlb/
 
/ˈlaɪt bʌlb/
(also bulb)
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  1. the glass part that fits into an electric lamp, etc. to give light when it is switched on
    • A single dim light bulb lit the room.
    • The room was lit only by a single 40-watt light bulb.
See light bulb in the Oxford Advanced American DictionarySee light bulb in the Oxford Learner's Dictionary of Academic English

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