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his's line in Medicine

His's line

(hĭsĭz)
n.
  1. An imaginary line extending from the tip of the anterior nasal spine to the hindmost point on the posterior margin of the foramen magnum, dividing the face into an upper and a lower part.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.