hy·per·bar·ic

[hahy-per-bar-ik]
adjective Medicine/Medical.
1.
(of an anesthetic) having a specific gravity greater than that of cerebrospinal fluid. Compare hypobaric.
2.
pertaining to or utilizing gaseous pressure greater than normal, especially for administering oxygen in the treatment of certain diseases.

Origin:
1925–30; hyper- + baric2

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
hyperbaric (ˌhaɪpəˈbærɪk) [Click for IPA pronunciation guide]
 
adj
of, concerned with, or operating at pressures higher than normal

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Hyperbaric is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
American Heritage
Medical Dictionary

hyperbaric hy·per·bar·ic (hī'pər-bār'ĭk)
adj.
Of, relating to, producing, operating, or occurring at pressures higher than normal atmospheric pressure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Alternative treatments include hyperbaric oxygen therapy and exchange
  transfusions.
The personnel of these facilities are well aware of the infection treatment
  value of hyperbaric treatment.
Two weeks ago he started therapy sessions in a hyperbaric oxygen chamber.
Summary of evidence report on hyperbaric oxygen therapy.
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