noun

1. the intercalation of a day, month, etc. into a calendar, as in leap year
2. the time intercalated
3. Med.
   1. the obstruction of a blood vessel by an embolus too large to pass through it
   2. loosely an embolus

Etymology: ME embolisme < LL embolismus < Gr embolismos, intercalary < embolos: see embolus