Thromb- (Thromb-), Thrombo- (Thrombo-)
Thromb- (Thromb-) and Thrombo- (Thrombo-) are prefixes in medical terminology, meaning:
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Blood clot (thrombosis). For example: thrombosis, thrombophlebitis.
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Thrombosis is the formation of a blood clot in a blood vessel. For example: thrombosis, thrombus formation.
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Platelets are formed elements of blood that play an important role in the process of blood clotting. For example: thrombocytopenia, thrombocytosis.
Thus, the prefixes thrombus- and thrombo- indicate such medical concepts as thrombus, thrombosis and platelets. They are widely used in anatomical and clinical terminology.