beam - definition and synonyms

noun [countable] 

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  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
  4. 5
    the widest part of a ship from one side to the other