Other Word Forms of Nightmare
Origin of Nightmare
From Middle English nightemare, niȝtmare, equivalent to night +"Ž mare (“evil spirit believed to afflict a sleeping person"). Cognate with Scots nichtmare, nichtmeer (“nightmare"), Dutch nachtmerrie (“nightmare"), Middle Low German nachtmār (“nightmare"), German Nachtmahr (“nightmare").
From American Heritage Dictionary of the English Language, 5th Edition
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