throm·bosisBrE/θrɒmˈbəʊsɪs/NAmE/θrɑːmˈboʊsɪs/noun[C, U] (throm·bosesBrE/θrɒmˈbəʊsiːz/NAmE/θrɑːmˈboʊsiːz/) (medical医学) aseriousconditioncausedbyabloodclot (= a thick mass of blood) forming in a blood vessel (= tube) orintheheart血栓形成➡ see alsocoronary thrombosis, deep vein thrombosis