What does the jamar means in greek?

"Jamar" is not a Greek word. It's possible you're thinking of a word from a different language, or perhaps a misspelling of a Greek word.

Could you provide more context or information about where you encountered this word?

For example:

* Was it in a specific text?

* Was it spoken aloud?

* Do you have any idea what it might refer to?

With more information, I can help you figure out the correct word or its meaning.