/ æmˈniːziə; NAmE -ˈniːʒə/ noun
[ U ] a medical condition in which sb partly or completely loses their memory
► am·nesiac / æmˈniːziæk; NAmE -ˈniːʒ-/ noun :
This new discovery helps amnesiacs keep their memory.
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WORD ORIGIN
late 18th cent.: from Greek amnēsia forgetfulness.