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sentinel gland

(sĕntə-nəl)
n.
  1. A single, enlarged lymph node in the omentum that may indicate an ulcer opposite to it in the greater or lesser curvature of the stomach.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.