mi·as·ma (mī-āz'mə, mē-) n.
pl.mi·as·mas or mi·as·ma·ta (-mə-tə)
A noxious atmosphere or influence: "The family affection, the family expectations, seemed to permeate the atmosphere . . . like a coiling miasma"(Louis Auchincloss).
A poisonous atmosphere formerly thought to rise from swamps and putrid matter and cause disease.
A thick vaporous atmosphere or emanation: wreathed in a miasma of cigarette smoke.
[Greek, pollution, stain, from miainein, to pollute.] mi·as'mal, mi'as·mat'ic (mī'əz-māt'ĭk), mi·as'mic (-mĭk) adj.
1665, from Gk. miasma (gen. miasmatos) "stain, pollution," related to miainein "to pollute," from PIE base *mei-/*mai- "to stain, defile" (cf. O.E. mal "stain, mark," see mole (1)).
Main Entry: mi·as·ma Pronunciation: mI-'az-m&, mE- Function: noun Inflected Form: pluralmi·as·masalsomi·as·ma·ta/-m&t-&/ : a vaporous exhalation (as of a marshy region or of putrescent matter) formerly believed to cause disease (as malaria) —mi·as·mal/-m&l/adjective —mi·as·mat·ic/"mI-&z-'mat-ik/adjective —mi·as·mic/mI-'az-mik, mE-/adjective