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effluvium

ef·flu·vi·um

effluvium

 
 
pronunciation:
ih flu vi m
part of speech: noun
inflections: effluvia, effluviums
definition: an outflow of usu. invisible, foul-smelling vapor or gas.
We camped downwind of the swamp and were nauseated by the effluvium of rotting vegetation.
similar words:
fume
derivation: effluvial (adj.)