For the noun: miasma
Plural form: miasmas, miasmata

WordReference Random House Learner's Dictionary of American English © 2014
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.

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:
In the English description:

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