Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for malignant from the 1913 edition of Webster's Revised Unabridged Dictionary. Define malignant using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: Noun
Results: 5
3. Tending to produce death; threatening a fatal issue; virulent; as, malignant diphtheria.
Part of Speech: noun
1. A man of extrems enmity or evil intentions.
2. One of the adherents of Charles L. or Charles LL.; - so called by the opposite party.
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