- embolism, intercalation - an insertion into a calendar
--1 is a kind of time interval, interval
--1 is a part of calendar - embolism - occlusion of a blood vessel by an embolus (a loose clot or air bubble or other particle)
--2 is a kind of occlusion
--2 has part: embolus
--2 has particulars:air embolism, aeroembolism, gas embolism; fat embolism; pulmonary embolism