Here's why it's likely a mistake:
* It resembles "Mediterranean," but the meaning would be different. The Mediterranean is a sea, not a descriptive term.
* "Sol" means "sun" in Latin, but it doesn't form a common word with "iterraneous."
If you encountered this word, it's important to clarify its context and potential origin.
* Was it a typo? Did you perhaps mean "Mediterranean"?
* Was it a specific term within a certain field? If so, provide more information about where you found it.
* Was it a creative wordplay? If so, the meaning could be open to interpretation.
Without more context, it's impossible to determine the true meaning of "soliterraneous."