WordReference Random House Learner's Dictionary of American English © 2017
mi•as•ma /maɪˈæzmə, mi-/USA pronunciation   n.[countable]pl.  -mas, -ma•ta 
    /-mətə/.USA pronunciation  
  1. unpleasant or harmful fumes:a miasma rising from the backed-up sewer.
  2. a dangerous deathlike influence:The room had a miasma of evil.

WordReference Random House Unabridged Dictionary of American English © 2017
mi•as•ma  (mī azmə, mē-),USA pronunciation n., pl.  -mas, -ma•ta 
    (-mə tə).USA pronunciation 
  1. noxious exhalations from putrescent organic matter; poisonous effluvia or germs polluting the atmosphere.
  2. a dangerous, foreboding, or deathlike influence or atmosphere.
mi•asmal, mi•as•mat•ic  (mī′az matik),USA pronunciation  mi′as•mati•cal, mi•asmic, adj. 
  • Greek míasma stain, pollution, akin to miaínein to pollute, stain
  • Neo-Latin
  • 1655–65

Collins Concise English Dictionary © HarperCollins Publishers::

miasma /mɪˈæzmə/ n ( pl -mata / -mətə/, -mas)
  1. an unwholesome or oppressive atmosphere
  2. pollution in the atmosphere, esp noxious vapours from decomposing organic matter
Etymology: 17th Century: New Latin, from Greek: defilement, from miainein to defile

miˈasmal, miasmatic /ˌmiːəzˈmætɪk/ adj

'miasma' also found in these entries:

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