atmospherium

American  

[at-muhs-feer-ee-uhm] / ˌæt məsˈfɪər i əm /

noun

PLURAL

atmospheria

1. an optical system used to simulate images of atmospheric phenomena, as cloud formations, storms, and day and night, on the inside of a dome.

2. a building in which this projection system is used.

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Etymology

Origin of atmospherium

First recorded in 1955–60; atmospher(e) ( def. ) + (planetar)ium ( def. )