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For the noun: miasma
Plural form: miasmas, miasmata

WordReference Random House Learner's Dictionary of American English © 2016
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 © 2016
mi•as•ma  (mī azmə, mē-), 
n., pl. -mas, -ma•ta 
    (-mə tə). 
  1. noxious exhalations from putrescent organic matter; poisonous effluvia or germs polluting the atmosphere.
  2. a dangerous, foreboding, or deathlike influence or atmosphere.
  • Greek míasma stain, pollution, akin to miaínein to pollute, stain
  • Neo-Latin
  • 1655–65
mi•asmal, mi•as•mat•ic  (mī′az matik), 
mi′as•mati•cal, mi•asmic, adj. 

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

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