Science Dictionary
malignant   (mə-lĭg'nənt)  Pronunciation Key 
  1. Tending to have a destructive clinical course, as a malignant illness.

  2. Relating to cancer cells that are invasive and tend to metastasize. Malignant tumor cells are histologically more primitive than normal tissue. Compare benign.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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