n.
A drug used to counteract the physiological effects of histamine production in allergic reactions and colds.
antihistaminic an'ti·his'ta·min'ic (-mĭn'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.