Musaf
/ˈmuːsəf/ /ˈmuːsaf/(also Musaph, Mussaf) Judaism
noun
An additional prayer service recited on the Sabbath and festivals, immediately after the Torah reading which follows the morning prayers. Also: an additional Temple sacrifice formerly required to be made on the Sabbath and festival days (now historical ).
Origin
Mid 17th century. From post-biblical Hebrew mūsāp (adjective) additional, (noun) addition, additional prayer from yāsap to add, increase.