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1706, Modern Latin, from Greek thrombosis "a clumping or curdling" (from thrombousthai "become curdled or clotted," from thrombos "clot, curd, lump;" see thrombus) + -osis.
thrombosis throm·bo·sis (thrŏm-bō'sĭs)n. pl. throm·bo·ses (-sēz) Formation or presence of a thrombus.
The development of a blood clot in the circulatory system. Depending on the location of the clot, the resultant loss of circulation can lead to a stroke (cerebral thrombosis) or heart attack (coronary thrombosis).