What is the feminine form of 'Czar'?

• Czar [noun]
English meaning:
1. Emperor, specifically: the ruler of Russia until the 1917 revolution.
2. One having great power or authority (a banking czar).
Bangla meaning: রাশিয়ার সম্রাট।

• Czarina is the feminine gender of 'czar'.
- Czarina- the wife of a czar.

Source: Merriam-Webster Dictionary.