Cassiopeia

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A W-shaped constellation in the Northern Hemisphere between Andromeda and Cepheus.

from The Century Dictionary.

• noun A beautiful circumpolar constellation, supposed to represent the wife of Cepheus seated in a chair and holding up both arms.
• noun [NL.] In zoology, the typical genus of the family Cassiopeiidæ.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Astron.) A constellation of the northern hemisphere, situated between Cepheus and Perseus; -- so called in honor of the wife of Cepheus, a fabulous king of Ethiopia.
• noun a group of six stars, in Cassiopeia, somewhat resembling a chair.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun Greek mythology Proud wife of Cepheus and mother of Andromeda, queen of Eritrea. When she boasted that her beauty was equal to that of the Nereids, she was punished by Poseidon.
• proper noun astronomy A circumpolar constellation of the northern sky representing Queen Cassiopeia from Greek myth. The constellation lies between Cepheus and Perseus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (Greek mythology) the wife of Cepheus and mother of Andromeda
• noun a W-shaped constellation in the northern hemisphere near Polaris