mah·zor also mach·zor 
(mäzôr′, -zər, mä-zôr)
(mäzôr′, -zər, mä-zôr)n. pl. mah·zor·im (-zôrĭm, -zô-rēm) or mah·zors also mach·zor·im or mach·zors
A Jewish prayer book used during the High Holy Days.
[Mishnaic Hebrew maḥăzôr, cycle, mahzor, from ḥāzar, to go around, return; see ḥḏr in the Appendix of Semitic roots.]