op·​i·​som·​e·​ter | \ ˌäpəˈsämətə(r)\

Definition of opisometer

: an instrument used for measuring curved lines (as on a map) and consisting essentially of a screw with a wheel-shaped nut that is made to rotate forward along the curved lines and then backward to its original position on the screw along a straight scale

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History and Etymology for opisometer

from Greek opisō backwards + English -meter; akin to Greek opisthen

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of or relating to the heavens

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