/zahr, tsahr/ , n.
1. an emperor or king.
2. ( often cap. ) the former emperor of Russia.
3. an autocratic ruler or leader.
4. any person exercising great authority or power in a particular field: a czar of industry.
Also, tsar, tzar .
[ 1545-55; tsar', ORuss tsisari emperor, king (akin to OCS tsesari ) kaisar emperor ( kaîsar Caesar CAESAR ]