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Haller's circle

(hălərz, hälərz)
n.
  1. A network of branches of the short ciliary arteries on the sclera around the point of entrance of the optic nerve.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.