Socratic irony

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Profession of ignorance and of willingness to learn, used as a ploy to spur others to discover their own ignorance through their attempts to explain a word or concept.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The practice or act of asking someone a question in order to demonstrate his or her ignorance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun admission of your own ignorance and willingness to learn while exposing someone's inconsistencies by close questioning