noun, plural ma·lig·nan·cies for 2, 3.

  1. the quality or condition of being malignant.
  2. malignant character, behavior, action, or the like: the malignancies of war.
  3. a malignant tumor.

noun plural -cies

  1. the state or quality of being malignant
  2. pathol a cancerous growth

n.c.1600, “malignant nature,” from malignant + -cy. Of growths, tumors, from 1680s. n.

  1. The state or quality of being malignant.
  2. A malignant tumor.
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