thrombosis
noun /θrɒmˈbəʊsɪs/
  /θrɑːmˈbəʊsɪs/
 [countable, uncountable] (plural thromboses 
 (medical) /θrɒmˈbəʊsiːz/
  /θrɑːmˈbəʊsiːz/
)- a serious condition caused by a blood clot (= a thick mass of blood) forming in a blood vessel (= tube) or in the heart see also coronary thrombosis, deep vein thrombosisTopics Illnessc2Word Originearly 18th cent.: modern Latin, from Greek thrombōsis ‘curdling’, from thrombos ‘blood clot’.