Final answer:
A "chronometer" is a device for measuring time, combining the word roots "chron" meaning "time" and "meter" meaning "measure".
Step-by-step explanation:
Based on the root "chron," which means "time," the word "chronometer" refers to (a) a device for measuring time. Specifically, a chronometer is a precise and accurate instrument designed for measuring and indicating time intervals, often used in navigation, astronomy, and other fields where precise timekeeping is crucial.
This term emphasizes the device's capability to provide accurate time measurements, aligning with the root meaning of "chron" as it relates to time.