Meaning of opisometer in English:

opisometer

Pronunciation /ˌɒpɪˈsɒmɪtə/

noun

  • A hand-held instrument for measuring the length of curved lines, especially on a map, usually having at its tip a small rotating wheel that is rolled along the line to be measured; a map-measurer.

    Originally the wheel turned on a screw and had to be rolled backwards along a straight scale until it reached its former position on the screw. The reading is now shown directly on a dial or digital display.

Origin

Mid 19th century. From ancient Greek ὀπίσω backwards (from ὀπι- + a suffix forming adverbs indicating direction) + -meter.