idiometer

noun
id·​i·​om·​e·​ter | \ˌidēˈämətə(r)\

Definition of idiometer 

: an instrument for ascertaining the personal equation of an astronomical observer

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First Known Use of idiometer

1881, in the meaning defined above

History and Etymology for idiometer

idio- + -meter

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Time Traveler for idiometer

The first known use of idiometer was in 1881

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