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aeroscope

nounmasculinetechnicalrare/ɐ.ɛ.ɾɔʃ.ˈkɔ.pju/a·e·ros·có·pi·o

Definition

An obsolete optical instrument for viewing distant objects through the atmosphere, or for measuring air transparency.

“The aeroscope was an early tool in meteorological observation.”

“He collected antique scientific instruments, including an aeroscope.”