An instrument that measures the volume or rate of flow of a fluid, such as a water meter or gas meter.
Compound of 'fluid' and 'meter' (from Greek 'metron' meaning measure). A technical term created when precise measurement of fluids became industrially important.
Your water meter is technically a fluidmeter! The first practical water meters were invented in the 19th century, and they revolutionized water utility billing by allowing accurate measurement instead of estimates.
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