GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Hyperbaric , a. [hyper- + baric.]
   Of, pertaining to, or using a pressure that is greater than normal atmospheric pressure; as, a hyperbaric chamber, where divers may decompress slowly to avoid the bends.
   PJC
   Of, pertaining to, or using an oxygen pressure that is greater than that at normal atmospheric pressure; as, a hyperbaric tent to provide additional oxygen to patients with breathing difficulty.
   PJC