retardant definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
something that retards; esp., a substance that delays a chemical reaction
that retards or tends to retard
retardant definition by American Heritage Dictionary
Acting or tending to retard. Often used in combination: flame-retardant pajamas for children; a fire-retardant security chest.
- re·tarˈdant noun