flowmeter

The word 'flowmeter' is a modern compound, transparently constructed from two English elements of distinct origins. The first element, 'flow', descends from the Proto-Germanic verb 'flōaną', which carried the core sense of moving smoothly and continuously like a river. The second element, 'meter', traces back to the ancient Greek noun 'metron', meaning a measure or standard of length, which entered English via Latin and French. The logical combination of these parts in the 19th or 20th century created a precise technical term: an instrument ('meter') specifically designed to quantify the rate or volume of a moving fluid ('flow'). This follows a common pattern in scientific English, where Greek-derived suffixes are appended to Germanic or Latin roots to form clear, functional terminology for tools and devices.

Structure: flow + meter - flow: From Old English 'flōwan', meaning to flow, stream, issue. It functions as the base noun denoting the substance or process being measured. - meter: From Greek 'metron', via French 'mètre', meaning a measure or measuring device. It functions as a combining form indicating an instrument for measuring.