1. Pertaining to pressure of ambient gases greater than one atmosphere.
2. Concerning solutions, more dense than the diluent or medium; in spinal anesthesia, a hyperbaric solution has a density greater than that of spinal fluid.
The information shown above for hyperbaric is provided by Stedman's.
* Stedman's, part of Lippincott Williams & Wilkins, provide a comprehensive line of health-science publications for healthcare professionals and medical students.