codependent

[koh-di-pen-duhnt]
adjective
1.
of or pertaining to a relationship in which one person is physically or psychologically addicted, as to alcohol or gambling, and the other person is psychologically dependent on the first in an unhealthy way.
noun
2.
one who is codependent or in a codependent relationship.

Origin:
1985–90

codependency, codependence, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

codependent
by 1905, in various senses, also co-dependent, from co- + dependent. Modern psycological sense is attested from c.1983. Related: Codependence, codependency.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Their relationships are interdependent, or perhaps codependent.
These factors are interrelated in the sense that disease stage, bulk, and biologic aggressiveness are frequently codependent.
The lesser long-nosed bat, an endangered species, has developed a codependent relationship with the saguaro.
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