What word means 'condition of clotting?'

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The idea here is naming a state related to clot formation within the vessels. Thrombosis is the term that fits because it comes from thrombus (a clot) plus the suffix -osis, which indicates a condition or disease state. So thrombosis literally means the condition of clotting, specifically the formation of a clot inside a blood vessel that can obstruct flow. Hemostasis, while connected to clotting, refers to the overall process that stops bleeding rather than a specific clotting condition. Leukopenia is simply a low white blood cell count, and vasoconstriction is narrowing of a blood vessel—neither describes a clotting condition.