axillary artery

n.
  1. A continuation of the subclavian artery in the armpit, becoming the brachial artery in the arm, with superior thoracic, thoracoacromial, lateral thoracic, subscapular, and posterior and superior circumflex humeral branches.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.