Malignant a. : Disposed to do harm, inflict suffering, or cause distress; actuated by extreme malevolence or enmity; virulently inimical; bent on evil; malicious.

Malignant a. : Characterized or caused by evil intentions; pernicious.

Malignant a. : Tending to produce death; threatening a fatal issue; virulent; as, malignant diphtheria.

Malignant n. : A man of extrems enmity or evil intentions.

Malignant n. : One of the adherents of Charles L. or Charles LL.; -- so called by the opposite party.

Example:
What is the difference between a benign and a Malignant tumor?

Taxonomy
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Defination from the web:
Malignant) Jump to: navigation, search "Malign" redirects here. For the noise musician, see Rosemary Malign. ... A malignant tumor may be contrasted with a non-cancerous benign tumor in that a malignancy is not self-limited in its growth, is capable of ...