What is "miasmal"

Usage examples of "miasmal".

I heard it, and knew no more--heard it as I sat petrified in that unknown cemetery in the hollow, amidst the crumbling stones and the falling tombs, the rank vegetation and the miasmal vapors--heard it well up from the innermost depths of that damnable open sepulcher as I watched amorphous, necrophagous shadows dance beneath an accursed waning moon.

I heard it, and knew no more--heard it as I sat petrified in that unknown cemetery in the hollow, amidst the crumbling stones and the falling tombs, the rank vegetation and the miasmal vapors-- heard it well up from the innermost depths of that damnable open sepulcher as I watched amorphous, necrophagous shadows dance beneath an accursed waning moon.