hour glass
Flippable sand timer
An hourglass is a device for measuring time, consisting of two glass bulbs connected by a narrow passage through which sand flows from top to bottom at a fixed rate.
Turning it over restarts the interval.
The shape—narrow in the middle, wider at both ends—describes hourglass figures in people and other objects.
Also spelled as two words.
- sandglassGrain-based timing device
- timepieceHour-measuring device
- countdownBackward enumeration to zero
- sand timerGranular duration measurer
- mortalityState of eventual death
turn it over · passing time · seconds · transience · duration · time-keeper · pocket-watch · interval · grains · sand · shifting sands · narrow waist · sands of time · running out of time · time is ticking · neck · impermanence · inevitability
hour glassatomic clock
Quantum-vibration timekeeping device
stopwatch · chronometer · digital clock · quartz watch · smartwatch
hour glasseternity
Boundless temporal existence
infinity · timelessness · perpetuity · immortality · the eternal