Produced by or originating from blood, especially describing a disease or infection that spreads through the bloodstream.
From Greek haima (blood) + -genous (producing or generated by). The term emerged in medical contexts during the 1800s to describe diseases transmitted via blood circulation.
This word revolutionized how doctors understand infections—before germ theory, physicians couldn't explain why diseases seemed to travel through the body, but 'hematogenous spread' finally gave them language for blood-borne pathogens like tuberculosis and sepsis.
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