steam - definition and synonyms

noun [uncountable] 

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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

    1. a.
  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)

See also