codependency

co-de·pen·dent or co·de·pen·dent   (kō'dĭ-pěn'dənt) adj.   Mutually dependent. Of or relating to a relationship in which one person is psychologically dependent in an unhealthy way on someone who is addicted to a drug or self-destructive behavior, such as chronic gambling. n.  One who is co-dependent or in a co-dependent relationship. co'de·pen'dence, co'de·pen'den·cy n.

Main Entry: co·de·pen·den·cy
Pronunciation: -d&n-sE
Function: noun
Inflected Form: plural -cies
: apsychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin)