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basilar artery

n.
  1. The union of the two vertebral arteries, running from the lower to the upper border of the pons, with anterior spinal, the two inferior cerebellar, the labyrinthine, pontine, and superior cerebellar branches.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.