noun🔗ShareA blood clot formed from platelets and other elements that forms in a blood vessel in a living organism, and causes thrombosis or obstruction of the vessel at its point of formation or travel to other areas of the body."After sitting for a long flight, the doctor worried that a thrombus might have formed in her patient's leg, blocking blood flow. "medicinephysiologydiseaseanatomybodyorganconditionbiochemistrybiologyChat with AIVocabulary GamePractice Reading