an area in the southern hemisphere of Mars, appearing as a light region when viewed telescopically from the earth.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for memnonia
The whole of this western city was known in the time of the Ptolemies and the Romans as the Memnonia.A History of Art in Ancient Egypt, Vol. II (of 2)|Georges Perrot