- An obstacle or impediment.
- In psychiatry, a conflictual agent that blocks behavior that could help resolve a personal struggle.
- In psychotherapy, anything that acts as an impediment to the insight, constructive change, healing, and growth of a patient (an unhealthy or primitive defense mechanism; secondary gain; conflicted ambivalence; unconscious motivation derived from residual conflict from an earlier developmental stage; stubbornness; lack of ability to detach, observe, or analyze).
[M.E., fr. O.Fr. barriere, fr. L.L. barraria]
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Examples: glitazone, GI cocktail, etc.