from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A light-emitting device that consists of a gas-filled glass tube or bulb and is used inside electric light fixtures and flashlights.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An evacuated glass
bulbcontaining 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
light + bulb, from Middle French bulbe, from Latin bulbus ("bulb, onion"), from Ancient Greek βολβός (bolbos, "plant with round swelling on underground stem").
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