nonpersistent war gas

nonpersistent war gas

[‚nän·pər′sis·tənt ′wȯr ‚gas]
(ordnance)
A chemical agent, that is, a war gas, normally effective in the open for 10 minutes or less at the point of dispersion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.