Light-bulb meaning

The definition of a light bulb is a way to channel electricity into a light fixture.
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Thomas Edison didn't invent the light bulb; but, in 1880 he made it more practical and useful by using bamboo for the filaments to have high electrical resistance.
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In 1878 Joseph Swan developed a light bulb in England that used carbon paper instead of bamboo for the filaments.
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They formed a company, Edison-Swan United, which was one of the biggest producers of light bulbs in the world.

An example of a light bulb is the incandescent light used in a lamp.

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A light-emitting device that consists of a gas-filled glass tube or bulb and is used inside electric light fixtures and flashlights.
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(figuratively) Used in reference to the sudden arrival of a realization, an inspiration, an idea, or the like.
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An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.
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(by extension) An article that resembles such a bulb and converts electricity to light by any process.

A fluorescent light bulb or an LED light bulb.

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Alternative form of light bulb.
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Origin of light-bulb

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