It's possible you meant one of these:
* Rehab: This is short for "rehabilitation" and refers to the process of restoring someone to health or normal function after an illness, injury, or addiction.
* Rehad (with an "h" at the end): This could be a misspelling of "rehad," which might be a slang term or a word specific to a certain community or region.
To help me understand what you meant, could you provide more context? For example:
* Where did you see or hear the word "rehad"?
* What was the sentence or situation where it was used?
With more information, I can give you a more accurate answer.