Mussaf
Mussaf (Hebrew: מוּסָף, also spelled Musaf or Musof) is a Jewish prayer service that is recited on Shabbat, Jewish holidays, Chol Hamoed, and Rosh Chodesh in addition to the three other services religious Jews recite daily: Shacharit (morning), Mincha (afternoon), and Maariv (evening). It is traditionally combined with Shacharit when recited.