Dictionary
re•tard•ant
Pronunciation: (ri-tär'dnt), [key]—
n. Chem.
any substance capable of reducing the speed of a given reaction.
—
adj.
retarding or tending to retard (usually used in combination):
fire-retardant construction materials. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.