bubble - definition and synonyms

noun [countable] 

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  1. 1
    a ball of air or gas in a liquid

    Heat the milk until bubbles form around the edge of the pan.

    1. a.
      a ball of air or gas in a substance that has become solid
  2. 2
    a structure that is round like a bubble
  3. 3
    the circle around the words said by people in a cartoon
  4.   From our crowdsourced Open Dictionary
    the emergency light on top of some police cars

    In the past couple of years, the MSP’s “bubble” overhead light began to undergo a conversion to Light Emitting Diodes (LEDs) to improve its energy efficiency.

    Submitted by Ramrath from Germany on 16/10/2014