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pernicious anemia

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noun Pathology.
  1. a severe anemia caused by the diminution or absence of stomach acid secretion, with consequent failure of the gastric mucosa to secrete the intrinsic factor necessary for the absorption of vitamin B12, characterized by a great reduction in the number of red blood cells and an increase in their size.

Origin of pernicious anemia

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
pernicious anemia in Medicine

antipernicious anemia factor

(ăn′tē-pər-nĭshəs, ăn′tī-)
n.
  1. 12" class="kw" data-linkid="nn1ov4">vitamin B12