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beam

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noun [countable] beam pronunciation in British English /biːm/ 
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singularbeam
pluralbeams
  1. 1
    a long thick piece of wood, metal, or concrete that supports a roof

    a cottage with low oak beams

  2. 2
    physics a line of light or other form of energy

    the beam of the car headlights

    a laser beam

  3. 3
    a wide happy smile

    A beam of happiness spread over her face.

    Synonyms and related words for this sense of beam
  4. 5
    the widest part of a ship from one side to the other
    Synonyms and related words for this sense of beam

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