The siddur and macḥzor are the two principal types of Jewish prayer books. In particular: * Siddur, from a Hebrew root meaning "order," refers to the prayer book generally used through the course of the year. The "complete" siddur will contain prayers for weekdays and Shabbat, for lifecycle events like weddings and circumcisions, and for most major and minor Jewish holidays. Less than "complete" editions, such as weekday-only or Shabbat-only siddurim, can also be found readily. * Machzor (also maḥzor or mahzor), from a Hebrew root meaning "cycle", refers to prayer books containing the prayers for the major holidays of the year.This term is most often encountered as referring to prayer books for the High Holy Days, Rosh Hashanah and Yom Kippur. The unique prayers of these days are so exte