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

1925–30; hyper- + baric2

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World English Dictionary
hyperbaric (ˌhaɪpəˈbærɪk)
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)
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
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