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pars amorpha

(ə-môrfə)
n.
  1. The part of the nucleolus that occupies irregular spaces in the nucleolonema and contains finely filamentous matter.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.