ste·nom·e·ter | \ stə̇ˈnämətə(r) , -mətə- \

Definition of stenometer 

: an instrument for measuring distances consisting of a telescope mounted on a tripod and fitted with a micrometer screw so that the distance may be measured to a rod carrying two targets a known distance apart whose images are brought together in the telescope by the micrometer screw

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History and Etymology for stenometer

sten- + -meter

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occurring twice a year or every two years

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