clock timer; timing clock; an alarm clock that can be set to ring at a specific time

The internal mechanism or rhythm that controls the timing of biological activities in living organisms

The internal physical mechanism that regulates the timing and rhythms of life activities in organisms, such as sleep, eating, or blooming; also called [[生物钟|生物鐘|sheng1 wu4 zhong1]] or [[生物时钟|生物時鐘|sheng1 wu4 shi2 zhong1]]

the constellation Horologium

clock that displays the time using digits rather than hands