noun
mist applies to a visible atmospheric vapor of rather fine density that blurs the vision; haze suggests a thin dispersion of smoke, dust, moisture, etc. that makes objects indistinct; fog suggests a greater density of moisture particles than mist, sometimes suggesting a thickness impenetrable by the vision; smog is applied to a low-lying, perceptible layer of polluted air or to a mixture of fog and smoke sometimes appearing in industrial centers: the first three terms are also used figuratively lost in the mists of the past, a troublesome haze of confusion, in a fog of doubt
See mist in Webster's New World Roget's A-Z Thesaurus II
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