from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A type of barometer whereby the liquid is suspended below air or other gas rather than a vacuum, so that the atmospheric pressure acts against the weight of the liquid and the pressure of the gas.
Irregular formation from Ancient Greek συμπίεσις (sympíesis, "compression") + -ometer. (Wiktionary)
The sympiezometer was invented in 1818 by Adie of Edinburgh.