malignant

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Related to Malign tissue: Malignant cell

malignant

1. Pathol (of a tumour) uncontrollable or resistant to therapy; rapidly spreading
2. History (in the English Civil War) a Parliamentarian term for a royalist
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

malignant

[mə′līg·nənt]
(cell and molecular biology)
Pertaining to cells that have undergone phenotypic transformation by oncogenes or protooncogenes.
(medicine)
Endangering the life or health of an individual.
Of or pertaining to the growth and proliferation of certain neoplasms which terminate in death if not checked by treatment.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.