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ray

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noun [countable] ray pronunciation in British English /reɪ/ 
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singularray
pluralrays
  1. 1
    [usually plural] an amount of light or heat from the sun

    The last rays of the sun were disappearing behind the mountains.

    Your skin needs protection from the sun's rays.

    1. a.
      a narrow line of light that you can see coming from the sun or a lamp

      He stood on the stage, illuminated by a dazzling ray of light.

    2. b.
      a line of energy in the form of heat or light

      Their instruments were able to detect faint rays of radiation.

      Sunglasses can filter out harmful ultraviolet rays.

  2. 2
    a large flat sea fish that has a long pointed tail
    Synonyms and related words for this sense of ray

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