from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of, relating to, producing, operating, or occurring at pressures higher than normal atmospheric pressure: a hyperbaric chamber.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of, relating to, or utilizing greater than normal pressure (as of oxygen).
from the GNU version of the Collaborative International Dictionary of English
- adj. of, pertaining to, or using a pressure that is greater than normal atmospheric pressure.
- adj. of, pertaining to, or using an oxygen pressure that is greater than that at normal atmospheric pressure.
hyper- + baric (Wiktionary)