gas-bounded nebula

gas-bounded nebula

[′gas ¦bau̇nd·əd ′neb·yə·lə]
(astronomy)
An emission nebula whose central star is hot enough, or in which the density of the cloud is small enough, to ionize the entire cloud.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.