Dictionary
psy•cho•chem•i•cal
Pronunciation: (sī"kō-kem'i-kul), [key]—
adj.
pertaining to chemicals or drugs that affect the mind or behavior.
—
n.
any such substance, esp. when used as a chemical warfare agent.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.