Definition of light bulb in English:

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light bulb

Pronunciation: /ˈlīt ˌbəlb/
(also lightbulb)

noun

A glass bulb inserted into a lamp or a socket in a ceiling, that provides light by passing an electric current through a filament or a pocket of inert gas.
Example sentences
  • The British Courts stood by their patent award for the light bulb to Swan, and Edison lost the suit.
  • Although this is optional, I highly recommend it because this helps make the light bulb less fragile.
  • Incandescent and halogen light bulbs can fade colors if they are very close to the light source.

For editors and proofreaders

Syllabification: light bulb

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