co·de·pen·dent 
(kō′dĭ-pĕndənt)
(kō′dĭ-pĕndənt)adj.
1. Mutually dependent.
2. 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 codependent or in a codependent relationship.
co′de·pendence, co′de·penden·cy n.