Opisometer

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Opisometer An instrument with a revolving wheel for measuring a curved line, as on a map.
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Century Dictionary and Cyclopedia
    • n opisometer An instrument for measuring curved lines upon a map. The instrument consists of a wheel turning as a nut upon a screw. The wheel, being brought hard up to a stop, or to a mark indicated by a pointer, is rolled over the line on the map so as to unscrew it, and is then rolled back over the scale to its former position.
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Chambers's Twentieth Century Dictionary
    • n Opisometer op-i-som′e-tėr an instrument for measuring curved lines on a map.
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Etymology

Webster's Revised Unabridged Dictionary
Gr. backwards + -meter,
Chambers's Twentieth Century Dictionary
Gr. opisō, backward, metron, measure.