hyperbaric

Adjective

hy=per=bar=ic

CIDE DICTIONARY

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]

hyperbaric, adj. (of a gas) at a pressure greater than normal.

Etymology

HYPER- + Gk barus heavy