Lyra

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

• noun A constellation in the Northern Hemisphere near Cygnus and Hercules and containing Vega.

from The Century Dictionary.

• noun An ancient northern constellation, representing the lyre of Hermes or of Orpheus. Also called the Harp.
• noun [lowercase; pl. lyræ (-rē).] In anatomy, a tract of the brain beneath the corpus callosum, on the under surface and between the divergent posterior pillars of the fornix.
• noun In zoology: A genus of fishes.
• noun A genus of brachiopods.
• noun [lowercase] See lira.

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

• noun (Astron.) A northern constellation, the Harp, containing a white star of the first magnitude, called Alpha Lyræ, or Vega.
• noun (Anat.) The middle portion of the ventral surface of the fornix of the brain; -- so called from the arrangement of the lines with which it is marked in the human brain.

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

• proper noun astronomy A summer constellation of the northern sky, said to resemble a lyre. It includes the bright star Vega and the Ring Nebula.
• proper noun rare A female given name.

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

• noun a small constellation in the northern hemisphere near Cygnus and Draco; contains the star Vega