The island of Patmos.
Patmos definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
island of the Dodecanese, in the SE Aegean: traditionally where St. John wrote the Book of Revelation (Rev. 1:9): 13 sq mi (34 sq km)
Patmos definition by American Heritage Dictionary
An island of southeast Greece in the Dodecanese Islands of the Aegean Sea. Saint John was exiled to the island c. A.D. 95 and according to tradition wrote the Book of Revelation here.