noun

a thick mass of coagulated liquid, especially blood, or of material stuck together.

a blood clot

lump,clump,mass,curdling,obstruction,glob,gob,thrombus,thrombosis,embolus,embolism

verb

form or cause to form clots.

drugs that help blood to clot

coagulate,set,congeal,cake,curdle,thicken,solidify,harden,dry,stiffen