from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An instrument for determining the weight and density of air or another gas.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instrument used to measure the mass and density of gases.
from the GNU version of the Collaborative International Dictionary of English
- n. An instrument for ascertaining the weight or density of air and gases.
from The Century Dictionary and Cyclopedia
- n. An instrument for weighing air, or for ascertaining the density of air and other gases.
aero- + -meter (Wiktionary)