Definitions

1. noun

an instrument for measuring the rate of flow of water, especially the volume passing a given point in a given time; a flowmeter.

“The engineers used a passometer to measure the water flow rate in the new dam.”

2. noun

an instrument for measuring the speed of a person or thing in passing a given point.

“The timing device used as a passometer in the track and field event recorded a time of 10.2 seconds.”