Medical terms related to blood often begin with the prefix haem-, which comes from the Greek word for blood. Therefore, the study of blood is haemotology, haemophilia is a disease of the blood, and haemophobia is an abnormal fear of blood. New blood is being constantly made by the bone marrow in a process called haemogenesis, bleeding is technically known as a haemorrage, and a bruise is a haemotoma.
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The prefix haem- means …