OPISOMETER
Source: 567
Op′i‐som″e‐ter (?), n. [[Gr. � backwards + -meter.]] An instrument with a revolving wheel for measuring a curved line, as on a map.
Source: 567
Op′i‐som″e‐ter (?), n. [[Gr. � backwards + -meter.]] An instrument with a revolving wheel for measuring a curved line, as on a map.