halo

halo definition - medical

ha·lo (hāˈlō)

noun pl. ha·los or ha·loes
  1. A reddish yellow ring surrounding the optic disk, caused by an expansion of the scleral ring that makes the deeper structures visible.
  2. Glaucomatous halo.
  3. A ring of light surrounding a luminous body.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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