throm ‧ bo ‧ sis /θrɒmˈbəʊsəs, θrɒmˈbəʊsɪs $ θrɑːmˈboʊ-/ BrE AmE noun ( plural thromboses ) [uncountable and countable]
[ Date: 1700-1800 ; Language: Modern Latin ; Origin: Greek , from thrombos 'clot' ]
technical a serious medical problem caused by a ↑ clot forming in your blood that prevents the blood from flowing normally