It's important to note that "palmyra" is the more commonly used English term for the palm tree that produces this starch, while "panai" is a Tamil word.
Here are some other possible translations, depending on the context:
* Palmyra tuber
* Palmyra root
* Palmyra flour (if referring to the starch in powdered form)
The most accurate translation depends on the specific context and the intended use of the term.