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distichia

(dĭ-stĭkē-ə)
n.
  1. A congenital abnormality in which there is an additional row of eyelashes that turn in upon the eye.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.