It's possible that:
* It's a misspelling. Perhaps you meant a similar-sounding word like "melted" or "melted away".
* It's a made-up word. This is common in fiction or fantasy settings.
* It's a specific term in a particular field. For example, it could be a technical term used in science, engineering, or a specific industry.
To get a better understanding of the meaning of "melrah", please provide more context. For example:
* Where did you encounter this word? (e.g., a book, a movie, a conversation)
* What was the context of the word? (e.g., what was being discussed or described?)
With more information, I can help you figure out what "melrah" means.