Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An optical device designed to project images of atmospheric phenomena, such as clouds, on the inside of a dome.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[atmospher(e) + (planetar)ium.]

Examples

  • You'll meet plot-device park rangers cringing in horror, learn all about the radioactive element "atmospherium," and ultimately witness the most absurd narrative coincidences this side of Seinfeld.

    The Lost Skeleton of Cadavra

  • But these dumb marrieds are not the only seekers of the meteorite; a pair of crash-landed aliens need to track down the atmospherium to power their ship, and an "evil scientist (?)" needs the element to resurrect a "lost skeleton" that he may "take over the world" in a poorly-defined fashion.

    The Lost Skeleton of Cadavra

  • Anyway, the aliens briefly and naively join forces with the evil scientist to acquire the atmospherium, only to be (surprise!) betrayed by the evil scientist -- who then tries to force the female alien to marry the (now up and kicking) Lost Skeleton of Cadavra.

    The Lost Skeleton of Cadavra

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