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1. An ancient city of northern Egypt in the Nile River delta north of modern Cairo. It was the center of worship of the sun god Ra until the rise of Thebes (c. 2100 bc). Its importance as a historical repository with famed schools of philosophy and astronomy declined after the founding of Alexandria in the fourth century bc. Two of its obelisks, both known as Cleopatra's Needle, are now in London and in New York City's Central Park.
2. See Baalbek.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Placename) (in ancient Egypt) a city near the apex of the Nile delta: a centre of sun worship. Ancient Egyptian name: On
2. (Placename) the Ancient Greek name for Baalbek
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌhi liˈɒp ə lɪs)

1. Biblical name, On. an ancient ruined city in N Egypt, on the Nile delta.
2. ancient Greek name of Baalbek.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
As reported by local dailies, the historical Palace Cinema, located in Heliopolis, Egypt has been reopened following a three-year renovation.
Viking opened 5 years ago at Heliopolis, Egypt. Then they opened their next branch in 2015 at Rehab city Square, while their third branch was opened this year in the Mall of Egypt and that was the place of my journey.
It's not clear if the ad pictured above - spotted in a shop window in Heliopolis, Egypt - is officially sanctioned by Ariel and we're going to go out on a limb and suggest not exactly, but it just goes to show that advertising can be powerfully pursuasive.