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fissura

(fĭ-sur′ə, -shur′ə)
n. pl. fis•su•rae (-sur′ē, -shur′ē)
  1. A deep fissure, cleft, or slit.
  2. A particularly deep sulcus of the surface of the brain or spinal cord.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.