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confluence of sinuses

n.
  1. The dilated area at the internal occipital protuberance where the superior sagittal, straight, occipital, and transverse sinuses of the dura mater meet.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.