An instrument used to measure the amount of vapor or moisture in the air; a hygrometer or similar device.
From Greek atmis (vapor) + -meter (measuring device), combining two Greek elements meaning 'vapor measurer.' This term dates to early meteorological instrumentation in the 18th-19th centuries.
The atmidometer is a beautiful example of how scientists loved compound words in the 1800s—today we just call this a 'hygrometer,' but atmidometer tells you exactly what it does: measure vapor!
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