a condition in which the number of red blood cells is below normal.
From Ancient Greek ἀν- (an-, “not”) + αἷμα (haîma, “blood”) +‎ -ia; those roots are the basis of the English combining forms an- + -aemia/-emia.
(米国用法 spelling, uncountable, pathology) A medical condition in which the capacity of the blood to transport oxygen to the tissues is reduced, either because of too few red blood cells, or because of too little hemoglobin, resulting in pallor and fatigue.
(countable, pathology) A disease or condition that has anemia as a symptom.
Pernicious anemia and sickle-cell anemia are two anemias.
In 21st century medical terminology, anemia never means ischemia, although in 19th through mid-20th century medical usage, it sometimes did.