variometer

noun
var·​i·​om·​e·​ter | \ˌver-ē-ˈä-mə-tər \

Definition of variometer 

1 : an instrument for measuring magnetic declination

2 : an aeronautical instrument for indicating rate of climb

First Known Use of variometer

circa 1889, in the meaning defined at sense 1

History and Etymology for variometer

borrowed from German Variometer, from vario- vario- + -meter -meter

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The first known use of variometer was circa 1889

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