distilled mustard gas

distilled mustard gas

[də′stild ′məs·tərd ‚gas]
(organic chemistry)
A delayed-action casualty gas (mustard gas) that has been distilled, or purified, to greatly reduce the odor and thereby increase its difficulty of detection.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.