atmospherium

noun

at·​mo·​sphe·​ri·​um

ˌatməˈsfirēəm

plural -s

1

: an optical device for projecting images of meteorological phenomena (such as clouds) on the inside of a dome

2

: a room housing an atmospherium

Word History

Etymology

blend of atmosphere and planetarium

First Known Use

1960, in the meaning defined at sense 1

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