Meaning of hypobaric

hy•po•bar•ic

Pronunciation: (hī"pu-bar'ik), [key]
— adj. Med.
  1. (of an anesthetic) having a specific gravity lower than that of cerebrospinal fluid. Cf. hyperbaric (def. 1).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.