n. pl. at·mo·spher·i·a (-ē-ə)
An optical device designed to project images of atmospheric phenomena, such as clouds, on the inside of a dome.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.