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Meaning of psychochemical

psy•cho•chem•i•cal

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