hyperbaric

[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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Collins
World English Dictionary
hyperbaric (ˌhaɪpəˈbærɪk)
 
adj
of, concerned with, or operating at pressures higher than normal

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
The personnel of these facilities are well aware of the infection treatment
  value of hyperbaric treatment.
Woods has said he has received oxygen treatment in a hyperbaric chamber.
Two weeks ago he started therapy sessions in a hyperbaric oxygen chamber.
Alternative treatments include hyperbaric oxygen therapy and exchange
  transfusions.
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