The Collaborative International Dictionary
disabuse \dis`a*buse"\, v. t. [imp. & p. p. Disabused; p. pr. & vb. n. Disabusing.] [Pref. dis- + abuse; cf. F. d['e]sabuser.] To set free from mistakes; to undeceive; to disengage from fallacy or deception; to set right; -- often used with of; as, to disabuse one of his illusions.
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.
Wiktionary
vb. (en-past of: disabuse)
WordNet
adj. freed of a mistaken or misguided notion; "some people are still not disabused of the old idea that the universe revolves around the Earth" [syn: disabused(p), undeceived]