9 letters · 15 points in Scrabble
noun a situation resembling a terrifying dream
noun a terrifying or deeply upsetting dream
originFrom Middle English nyghtmare, from Old English *nihtmare, equivalent to night + mare (“evil spirit believed to afflict a sleeping person”). Cognate with Scots nichtmare and nichtmeer, Dutch nachtmerrie, Middle Low German nachtmār, German Nachtmahr.
Etymology from Wiktionary, CC BY-SA 3.0