Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

light bulb

noun [C]
 
 
(also bulb)

Definition

a rounded glass container with a thin thread of metal inside that produces light when an electric current goes through itLighting and light fittings in the home
(Definition of light bulb noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of light bulb