tropometer

noun
tro·​pom·​e·​ter | \trōˈpämətə(r)\

Definition of tropometer 

: a device to measure rotation (as of the eyeball) or amount of torsion of a long bone

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First Known Use of tropometer

1881, in the meaning defined above

History and Etymology for tropometer

International Scientific Vocabulary trop- entry 1 + meter

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The first known use of tropometer was in 1881

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