opisometer/ɒpɪˈsɒmɪtə(ɹ)/EtymologyFrom Ancient Greek ὀπίσω (opísō, “backward”) + -meter.opisometer means A device for measuring the length of curved lines, such as on a map. Lexicurio rates it Sui generis — a strength score of 88 out of 100.nounA device for measuring the length of curved lines, such as on a map.