noun

• (uncountable, countable) The state or condition of being blocked.
• (countable) The thing that is the cause of such a state, blocking a passage.
• (biology, medicine) Occlusion of a lumen (especially that of a blood vessel or intestine), or the thing that is causing it; as:
• Synonym of thrombosis, synonym of thromboembolism, or synonym of embolism.
• Synonym of constipation (“impairment of feces passage”).