1. Greek Mythology. The daughter of Cepheus and Cassiopeia and wife of Perseus, who had rescued her from a sea monster.
2. A constellation in the Northern Hemisphere between Lacerta and Perseus and south of Cassiopeia. It contains a large spiral galaxy visible to the naked eye. The spiral is 2.2 million light-years from Earth.

[Latin, from Greek Andromedē.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.