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albuginea

[ăl′bə-jĭn′ē-ə, -byə-]
n.
  1. A tough whitish layer of fibrous tissue, especially the dense white membrane covering the testicle.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.