n. a metabolic defect which contibutes to the onset of a neurological or psychiatric condition. This defect may either be inherited or congenital. In line with chemistry, it may be a matter of how a protein is produced or how a neurotransmitter is released.
BIOCHEMICAL DEFECT: "Usually, a biochemical defect traces back to a dysfunction related to proteins, hormones, enzymes, and neurotransmitters."
