tsar
Concise Oxford English Dictionary © 2008 Oxford University Press:
tsar /zɑː, tsɑː/ (also czar or tzar)
▶noun
- 1 an emperor of Russia before 1917.
■ a South Slav ruler in former times, especially one reigning over Serbia in the 14th century.
- 2 a person with great power in a particular area: America's new drug tsar.
– derivatives
tsardom noun,
tsarism noun,
tsarist noun & adjective.
tsardom noun,
tsarism noun,
tsarist noun & adjective.
– origin from Russ. tsar′, representing L. Caesar.
'tsar' also found in these Oxford entries:

