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follicle of the thyroid gland

n.
  1. Any of the small spherical vesicular components of the thyroid gland lined with epithelium and containing a colloid substance that stores thyroid hormones.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.