czar /zɑː $ zɑːr/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: Russian ; Origin: tsar' , from Gothic kaisar 'emperor' , from Greek , from Latin Caesar , from Julius Caesar ; ⇨ ↑ cesarean ]
1 . another spelling of ↑ tsar
2 . banking/drug/health etc czar American English someone who is very powerful in a particular job or activity