Webster's English Dictionary

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miasma

mi.as.ma \mi--'az-m*, me--\ \-'az-m*t-*\ \-m*l\ \mi--*z-'mat-ik\ 
   \mi--'az-mik, me--\ n or miasmas or mi.as.ma.ta [NL, fr. Gk, defilement, 
   fr. miainein to pollute] pl  1: a vaporous exhalation formerly believed to 
   cause disease; broadly  : a heavy vaporous emanation 2: a noxious influence 
   or atmosphere  - mi.as.mal aj