Person who suffers from loss of memory (amnesia).(noun)
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Use "amnesiac" in a sentence
"They call the amnesiac Marc Blucas, AKA Riley from Buffy Jay and try to discover his identity as well as his connection to the gallery shooting."
"This occurs when what is called amnesiac walls begin to disintigrate allowing for memories of one or the other to pass back and forth."
"Domoic acid above threshold unsafe levels cause an escalating toxic reaction in humans called amnesiac shellfish poisoning, which can result in permanent damage or death."