Source : WordNet®

Id al-Adha
     n : the 10th day of Dhu'l Hijja; all Muslims attend a service in
         the mosques and those who are not pilgrims perform a
         ritual slaughter of a sheep (commemorating God's ransom
         of Abraham's son from sacrifice) and give at least a
         third of the meat to charity [syn: {Feast of Sacrifice}]