deep vein thrombosis
noun [uncountable, countable](abbreviation DVT)
(a serious condition caused by a blood clot (= a thick mass of blood) forming in a vein 深静脉血栓形成 Passengers on long-haul flights are being warned about the risks of deep vein thrombosis. 长途航班上的乘客须注意可能出现深静脉血栓。