adjective Medicine/Medical.
(of an anesthetic) having a specific gravity lower than that of cerebrospinal fluid. Compare hyperbaric ( def 1 ).

1925–30; hypo- + Greek bár(os) weight + -ic

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American Heritage
Medical Dictionary

hypobaric hy·po·bar·ic (hī'pə-bār'ĭk)

  1. Relating to ambient gas pressures below one atmosphere.

  2. Less dense than diluent or medium. Used of solutions.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hypobaric   (hī'pə-bār'ĭk)  Pronunciation Key 
Relating to conditions of low air pressure and low oxygen content, such as atmospheric conditions at high altitudes, or in special chambers used to establish low-pressure conditions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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