1. 
   Opisometer
   Op`i·som'e·ter noun [ Greek ... backwards + -meter .] An instrument with a revolving wheel for measuring a curved line, as on a map.
   Found op http://www.encyclo.co.uk/webster/O/25
   
   
2. 
   Opisometer
   • (n.) An instrument with a revolving wheel for measuring a curved line, as on a map.
   Found op http://thinkexist.com/dictionary/meaning/opisometer/
   
   
3. 
   Opisometer
   An opisometer, also called a curvimeter, meilograph or map measurer, is an instrument for measuring the lengths of arbitrary curved lines. A simple opisometer consists of a toothed wheel of known circumference on a handle. The wheel is placed in contact with the curved line to be measured and run a...
   Found op http://en.wikipedia.org/wiki/Opisometer
   
   
4. 
   Opisometer
   Mechanical device for measuring non-linear distances on maps.
   Found op http://www.physicalgeography.net/physgeoglos/o.html
   
   
5. 
   Opisometer
   An opisometer is an instrument with a revolving wheel used for measuring a curved line, such as on a map.
   Found op http://www.probertencyclopaedia.com/browse/GO.HTM
   
   

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