czar

The word 'czar' entered English in the 1550s from Russian 'tsar', which itself derived from Old Slavic 'tsĭsarĭ'. This Slavic title is ultimately a borrowing from the Latin 'Caesar', the family name of Julius Caesar, which became a generic title for Roman emperors. The linguistic journey, from a specific Roman surname to a Slavic imperial title and finally to an English term for any powerful authority, illustrates the potent symbolism of the original Caesar's name as a byword for supreme rule. The modern, figurative sense of an all-powerful person, as in "drug czar" or "energy czar", directly extends this logic of absolute, singular authority.

The word is a loanword adopted as a single, unanalyzable unit into English. Its components are not productive morphemes within the English language system.