Heterophemy
Pronunciation : Het`er*oph"e*my
Part of Speech : n.
Etymology : [Hetero- + Gr.
Definition : Defn: The unconscious saying, in speech or in writing, of that which one does not intend to say; -- frequently the very reverse of the thought which is present to consciousness. R. G. White.
Source : Webster's Unabridged Dictionary, 1913