Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
something that retards; esp., a substance that delays a chemical reaction
that retards or tends to retard
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Acting or tending to retard. Often used in combination: flame-retardant pajamas for children; a fire-retardant security chest.
- re·tarˈdant noun