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Meaning of John o'Groat's House

John' o'Groat's' House"

Pronunciation: (u-grōts'), [key]
  1. the northern tip of Scotland, near Duncansby Head, NE Caithness, traditionally thought of as the northernmost point of Britain:Also called from Land's End to John o'Groat's House.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.