say it: muh-LIG-nuhn-see
malignancy is a noun meaning "(medicine) a malignant state; progressive and resistant to treatment and tending to cause death". It carries 2 recorded senses.
(medicine) a malignant state; progressive and resistant to treatment and tending to cause death
medicine
quality of being disposed to evil; intense ill will
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for malignancy come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.