From The Collaborative International Dictionary of English v.0.44 [gcide]:
Antiphrasis \An*tiph"ra*sis\, noun [L., fr. Gr. ?, fr. ? to express by antithesis or negation.] (Rhet.) The use of words in a sense opposite to their proper meaning; as when a court of justice is called a court of vengeance.
From WordNet (r) 2.0 [wn]:
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