What does aneroid mean?
An aneroid is an instrument for measuring atmospheric pressure that operates without any liquid, distinguishing it from the traditional mercury barometer. Its heart is a small, sealed metal capsule from which most of the air has been evacuated; as external pressure rises or falls, the thin walls of this capsule flex inward or outward, and a system of levers and springs translates those tiny movements into a readable dial. The name itself reflects the design: it derives from Greek elements meaning essentially 'without liquid.' Invented by the Frenchman Lucien Vidie in the nineteenth century, the aneroid quickly became prized for its portability and safety, since it contained no toxic mercury and could be carried aboard ships, aircraft, and expeditions. Beyond weather stations, the same principle underlies the aneroid sphygmomanometer used to measure blood pressure and the aneroid altimeter used in aviation. Though digital sensors have largely displaced it, the aneroid remains a familiar and respected piece of scientific instrumentation.
A barometer that measures atmospheric pressure using a sealed, flexible metal cell from which most of the air has been evacuated, instead of a column of liquid.
"The meteorologist calibrated the aneroid against a standard mercury barometer."
Often used attributively as an adjective, as in 'aneroid barometer' or 'aneroid altimeter'.
Relating to or denoting an instrument that measures pressure by means of a sealed, partially evacuated metal cell rather than a liquid column.
"She preferred an aneroid sphygmomanometer because it needed no mercury to function."
Regular plural form, used when referring to multiple aneroid instruments.
"The laboratory stocked several aneroids of different ranges for its calibration work."
Invented in the 19th century, the word 'aneroid' literally means 'without water' — a clever name for a barometer that banished mercury entirely.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does aneroid come from?
The word 'aneroid' was coined in the nineteenth century by the French inventor Lucien Vidie, who patented the liquid-free barometer in the 1840s. It combines the Greek privative prefix a(n)-, meaning 'without,' with the Greek element neros, meaning 'liquid' or 'water,' so the name literally signifies 'without liquid.' The same Greek privative prefix appears in other scientific terms such as 'anaerobic' and 'anhydrous,' which likewise denote the absence of something.
How aneroid is actually used
The word is technical and appears mainly in scientific, meteorological, aviation, and medical contexts; it is rare in everyday conversation. When used attributively ('aneroid barometer'), it functions as an adjective describing the mechanism of the instrument it modifies.
Easily confused with aneroid
A barometer is any instrument for measuring air pressure, while an aneroid is specifically the liquid-free kind that uses a sealed metal cell instead of mercury.