1. A reference to something that causes poisonous fumes or unwholesome smoke into the air: There is one bar in Mike's neighborhood that allows its customers to pollute the place with miasmatic cigarette and cigar smoke without any restrictions.
2. Characterized by an oppressive and unpleasant atmosphere: Historians know about some territories from the past and their long and miasmatic histories.
3. Etymology: from French miasme; from Greek miasma, "defilement, pollution"; which came from miamein, "to pollute".