Relating to animals or organisms that live as parasites in blood.
Greek haima (blood) + zōon (animal) + -ic (relating to). This scientific adjective developed alongside microscopy in the 1800s as scientists discovered tiny creatures living in vertebrate blood.
When researchers first saw haematozoic parasites under microscopes, they couldn't believe such complex creatures could be invisible to the naked eye—it completely changed medicine's understanding of where diseases came from.
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