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substernal goiter

(sŭb-stûrnəl)
n.
  1. Goiter, chiefly of the lower part of the isthmus of the thyroid gland, that is not easily palpable.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.