from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An electric light in which a filament is heated to incandescence by an electric current.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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


light + bulb, from Middle French bulbe, from Latin bulbus ("bulb, onion"), from Ancient Greek βολβός (bolbos, "plant with round swelling on underground stem"). (Wiktionary)


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