amnesia
amnesia (am*nē"zhu or am*nē"zi*ȧ) , noun
[New Latin, from Greek 'amnhsi`a; 'a priv. + mna^sqai to remember.]
1.
(Medicine) Forgetfulness; loss of long-term memory. — Quian
2.
(Medicine) A defect of speech, from cerebral disease, in which the patient substitutes wrong words or names in the place of those he wishes to employ. [Obsolete] — Quian