1. precise timekeeping instruments, especially those used for navigation at sea
Usage: plural of chronometer; often nautical

Examples

• The ship’s chronometers were essential for determining longitude during the voyage.
• Maritime museums often display antique chronometers used by famous explorers.
• The captain checked all three chronometers to ensure accurate navigation.
• Swiss chronometers were prized for their exceptional precision.
• Modern GPS has largely replaced the need for traditional chronometers at sea.
• The observatory tested and certified the chronometers before they were sold to sailors.