Embolism

noun

1. An obstruction or occlusion of an artery by an embolus, that is by a blood clot, air bubble or other matter that has been transported by the blood stream.
2. The insertion or intercalation of days into the calendar in order to correct the error arising from the difference between the civil year and the solar year.
3. An intercalated prayer for deliverance from evil coming after the Lord's Prayer.