chronometer
Meaning
An instrument for measuring time very accurately, especially one used in navigation.
Structure
Usage
The ship's captain relied on the marine chronometer for accurate navigation.
This antique chronometer is still in perfect working order.
Winning the competition required a chronometer that could measure to the thousandth of a second.
Etymology
The word chronometer is a modern scientific compound, directly assembled from classical Greek roots to precisely name a new invention. The first element, 'chrono-', derives from the Greek noun 'khronos', which fundamentally meant 'time' in a linear, measurable sense. The second element, '-meter', originates from the Greek noun 'metron', meaning 'a measure' or 'standard of measurement'. When combined in the 18th century, these morphemes logically created a term meaning "time-measurer," specifically coined for highly precise portable clocks essential for determining longitude at sea. Thus, the word's construction transparently reflects its function: an instrument designed for the exact measurement of time.
Analysis
'chrono' is from Greek 'khronos', meaning 'time'. It functions as a combining form indicating time. 'meter' is from Greek 'metron', meaning 'measure'. It functions as a combining form indicating an instrument for measuring.