The Greek root meter means measure. Which word does not come from this root?

The word that does not come from the Greek root "meter" meaning "measure" is meteor.

Here's why:

* Meter (measurement) - directly derived from the root.

* Thermometer (measuring temperature) - combines "thermo" (heat) with "meter."

* Perimeter (measurement of the boundary) - combines "peri" (around) with "meter."

* Meteor (a piece of space debris entering the atmosphere) - derived from the Greek word "meteoros" meaning "high in the air," not related to measurement.