a. [ L. perniciosus, from pernicies destruction, from pernecare to kill or slay outright; per + necare to kill, slay: cf. F. pernicieux. Cf. Nuisance, Necromancy. ] Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked. [ 1913 Webster ]
Let this pernicious hour Stand aye accursed in the calendar. Shak. [ 1913 Webster ]
Pernicious to his health. Prescott. [ 1913 Webster ]
(n) a chronic progressive anemia of older adults; thought to result from a lack of intrinsic factor (a substance secreted by the stomach that is responsible for the absorption of vitamin B12), Syn.malignant anemia, pernicious anaemia, malignant anaemia
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