What does "disabuse" mean?

Disabuse: To set free from mistakes; to undeceive; to disengage from fallacy or deception; to set right. To undeceive and disabuse the people. South. If men are now sufficiently enlightened to disabuse themselves or artifice, hypocrisy, and superstition, they will consider this event as an era in their history. J. Adams.