Here are some examples of words that use this root:
* Meter: a unit of measurement for length
* Geometry: the study of shapes and their measurements
* Thermometer: a device that measures temperature
* Barometer: a device that measures atmospheric pressure
* Chronometer: a device that measures time
* Perimeter: the distance around a shape
* Diameter: the distance across a circle through its center
* Symmetry: the quality of being balanced or having equal proportions
* Metric: a system of measurement
* Measurement: the process of finding the size, quantity, or amount of something
You can often recognize words with the metr- root because they are related to the concept of measurement.