Definition from Wiktionary, the free dictionary
See also meter
From Ancient Greek μέτρον (metron, “measure”).
Usage notes 
- Unlike the unit of length (meter/metre), this spelling applies to both American and British English.
- Words with the suffix -meter always has a primary stress on the antepenultimate syllable: barometer, speedometer, tachometer, etc. Words derived from meter (or metre) with a prefix usually have a primary stress on the first syllable: centimeter, millimeter, etc.
Derived terms