The mahzor (alternately machzor, plural mahzorim, Hebrew מחזור, and [maxzoˈrim])'s the prayer book used by Jews on the High Holidays of Rosh Hashanah and Yom Kippur. Many Jews also make use of specialized mahzorim on the three "pilgrimage festivals" of Passover, Shavuot, and Sukkot. The prayer book's a specialized form of the siddur, the prayerbook used by Jews the world over. The word mahzor means "cycle" (the root Ħ-Z-R means "to return"). It's applied t… (More on Mahzor)