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The Collaborative International Dictionary of English v.0.48 (gcide)

amnesia \am*ne"si*a\ ([a^]m*n[=e]"zh[u^] or
[a^]m*n[=e]"z[i^]*[.a]), n. [NL., fr. Gr. 'amnhsi`a; 'a priv.
mna^sqai to remember.]
1. (Med.) Forgetfulness; loss of long-term memory. --Quian.
[1913 Webster AS]

2. (Med.) 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. [Obs.] --Quian.
[1913 Webster AS]