amnesiac

[am-nee-zhee-ak, -zee-]
noun
1.
a person affected by amnesia.
adjective
2.
Also, amnesic [am-nee-sik, -zik] . displaying the symptoms of amnesia.

Origin:
1910–15; amnesi(a) + -ac, after such pairs as mania, maniac

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World English Dictionary
amnesia (æmˈniːzjə, -ʒjə, -zɪə)
 
n
a defect in memory, esp one resulting from pathological cause, such as brain damage or hysteria
 
[C19: via New Latin from Greek: forgetfulness, probably from amnēstia oblivion; see amnesty]
 
amnesiac
 
adj, —n
 
amnesic
 
adj, —n

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Etymonline
Word Origin & History

amnesiac
"one affected by amnesia," 1913, from amnesia (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

amnesiac am·ne·si·ac (ām-nē'zē-āk', -zhē-āk')
n.
One who is afflicted with amnesia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
It highlights the way in which other countries are complacent or amnesiac about their history.
The great thing about shamelessness is that in an amnesiac culture, it works.
She has wandered aimlessly as an amnesiac and been kidnaped by aliens.
In amnesiac revery it is easy to overlook the services that ecosystems provide humanity.
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