ceilometer

noun
ceil·om·e·ter | \sē-ˈlä-mə-tər \

Definition of ceilometer 

: a photoelectric instrument for determining by triangulation the height of the cloud ceiling above the earth

First Known Use of ceilometer

1943, in the meaning defined above

History and Etymology for ceilometer

ceiling + -o- + -meter

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The first known use of ceilometer was in 1943

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