A condition characterized by abnormally low levels of hemoglobin or deficiency of blood in the body.
From Greek 'an-' (without) + 'haima' (blood) + '-osis' (condition). It describes pathological states involving insufficient blood or blood components.
Ancient physicians used this term to describe patients with severe anemia, before they understood that red blood cells carry iron-rich hemoglobin—they could observe the pallor and weakness but not the molecular cause!
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