Usually means: Device that emits light electrically.
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We found 24 dictionaries that define the word light bulb:

General (19 matching dictionaries)
  1. light bulb: Longman Dictionary of Contemporary English
  2. light bulb: Merriam-Webster
  3. light bulb: Oxford Learner's Dictionaries
  4. light bulb: American Heritage Dictionary of the English Language
  5. light bulb: Collins English Dictionary
  6. light bulb: Vocabulary.com
  7. light-bulb: Wordnik
  8. light bulb: Cambridge Advanced Learner's Dictionary
  9. light-bulb, light bulb: Wiktionary
  10. light bulb: The Wordsmyth English Dictionary-Thesaurus
  11. light bulb: Infoplease Dictionary
  12. light bulb: Dictionary.com
  13. Light Bulb, Light-bulb, Light bulb, The light bulb: Wikipedia, the Free Encyclopedia
  14. light bulb: Rhymezone
  15. light bulb: FreeDictionary.org
  16. light bulb: Mnemonic Dictionary
  17. light bulb: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. light bulb: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. Brilliant Dream Dictionary (No longer online)

Science (1 matching dictionary)
  1. light bulb: LITTLE EXPLORERS(TM) Picture Dictionary

Slang (1 matching dictionary)
  1. light bulb: Urban Dictionary

Tech (1 matching dictionary)
  1. AUTOMOTIVE TERMS (No longer online)

(Note: See light_bulbs as well.)

Definitions from Wiktionary (light bulb)

noun:  An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.
noun:  (by extension) An article that resembles such a bulb and converts electricity to light by any process.
noun:  (figuratively) Used in reference to the sudden arrival of a realization, an inspiration, an idea, or the like.

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