Zil Hijjah:

The last month of the Islamic calendar. It is in this month that the Hajj is performed.

Zimmi:

A non-Muslim person living in an Islamic state under the protection of the Islamic state.

Zuhr:

Literally means "mid-day". In kitaabus salaat it refers to the mid-day prayer. It is referred to as zuhr salaat or salaatuz zuhr.