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steam - definition and synonyms

 
 
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noun [uncountable] steam pronunciation in American English /stim/
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  1. 1
    the hot wet substance like a thin cloud that is produced when water is heated
    The steam from the volcano rose into the air.
    a steam bath
  2. 2
    power that is created when water is heated
    The equipment was originally powered by steam.
    the age of steam (=when trains were operated by steam)
    1. a.
      [only before noun] operated by steam
      a steam engine/locomotive/

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an ancient Roman system of underfloor heating, used to heat houses with hot air; from the Latin 'hypocaustum'

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