A megaloblastic anemia occurring in children but more commonly in later life, characterized by histamine-fast achlorhydria, in which the laboratory and clinical manifestations are based on malabsorption of vitamin B 12 due to a failure of the gastric mucosa to secrete adequate and potent intrinsic factor. (Dorland, 27th ed)

Synonyms: Anemia, Addisons, Addisons Anemia, Anemia, Addison, Anemia, Pernicious, Anemia, Addison's, Addison Anemia, Pernicious Anemia, Addison's Anemia