Osmometer

Part of speech: noun

Definitions

1. An apparatus utilized for gauging osmotic pressure within solutions
2. A scientific instrument designed to evaluate solute concentration by measuring osmotic effects on semi-permeable barriers
3. A device that measures the osmotic pressure exerted by a solution to determine the concentration of solutes present

Etymology: "Osmometer" is a plain technical coinage built from two Greek-derived pieces. The first, "osmo-", comes from Greek "ōsmos," meaning "push" or "thrust," which gave English "osmosis," the process by which solvent passes through a membrane toward a more concentrated solution. The second, "-meter," comes from Greek "metron," "measure," the same element found in "thermometer" and "barometer." Put together, the name describes exactly what the instrument does: it measures the osmotic pressure that builds up when a solution is separated from pure solvent by a semipermeable membrane. Because the word is a compound of classical elements assembled for a scientific purpose, its meaning stays tied to its parts rather than drifting over time, so there is little more to trace beyond the components themselves.