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miasma

[mahy-az-muh, mee-] /maɪˈæz mə, mi-/
noun, plural miasmas, miasmata
[mahy-az-muh-tuh, mee-] /maɪˈæz mə tə, mi-/ (Show IPA)
1.
noxious exhalations from putrescent organic matter; poisonous effluvia or germs polluting the atmosphere.
2.
a dangerous, foreboding, or deathlike influence or atmosphere.
Origin
1655-1665
1655-65; < Neo-Latin < Greek míasma stain, pollution, akin to miaínein to pollute, stain
Related forms
miasmal, miasmatic
[mahy-az-mat-ik] /ˌmaɪ æzˈmæt ɪk/ (Show IPA),
miasmatical, miasmic, adjective
unmiasmal, adjective
unmiasmatic, adjective
unmiasmatical, adjective
unmiasmic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un miasmic

miasma

/mɪˈæzmə/
noun (pl) -mata (-mətə), -mas
1.
an unwholesome or oppressive atmosphere
2.
pollution in the atmosphere, esp noxious vapours from decomposing organic matter
Derived Forms
miasmal, miasmatic (ˌmiːəzˈmætɪk), miasmatical, miasmic, adjective
Word Origin
C17: New Latin, from Greek: defilement, from miainein to defile
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for un miasmic

miasma

n.

1660s, from Modern Latin miasma "noxious vapors," from Greek miasma (genitive miasmatos) "stain, pollution, defilement, taint of guilt," from stem of miainein "to pollute," from possible PIE root *mai- "to stain, soil, defile" (cf. Old English mal "stain, mark," see mole (n.1)). Earlier form was miasm (1640s), from French miasme. Related: Miasmatic; miasmal.

Online Etymology Dictionary, © 2010 Douglas Harper
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