What is the term for 'water clock' in Latin?

The term for 'water clock' in Latin is "clepsydra." This word is derived from the Greek "klepsudra," which translates to 'water thief,' used to describe how water was 'stolen' or used to measure time. In ancient times, a clepsydra was a device that regulated the flow of water to measure time intervals, often utilized in various settings such as courts and public offices.

The other terms offered relate to timekeeping or measurement but do not specifically refer to a water clock. "Horologium" typically refers to any kind of clock or time-measuring device, while "tempus" means time itself. "Tempus aquae" translates to 'time of water' but is not a standard term used in classical Latin for water clocks. Thus, "clepsydra" is the specific and accurate term for 'water clock.'