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hydatidiform mole

n.
  1. A vesicular or polycystic placental mass resulting from the proliferation of the trophoblast and the hydropic degeneration and avascularity of the chorionic villi, usually indicative of an abnormal pregnancy.mole2
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.