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tonofibril

(tŏn′ō-fībrəl, -fĭbrəl)
n.
  1. One of a system of fibers found in the cytoplasm of epithelial cells.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.