What is Clot ?
Clot is (noun) 1. a soft mass of thickened blood in a vein or an artery The doctor diagnosed a blood clot in the brain. 2. a fool You stupid clot, you put the milk carton into the fridge upside down!(verb) (of blood) to thicken, changing from semi-liquid to semi-solid In people with haemophilia, blood clots very slowly. Synonym coagulate (NOTE: clotting – clotted)
source: Easier English, Student Dictionary Upper Intermediate Level