Here are some possibilities:
* Cloud: This is the most likely word if "cloux" is a misspelling. It's pronounced klowd.
* Clou: This is a French word meaning "nail". It's pronounced kloo.
* Clough: This is an English word meaning "a narrow valley, especially one with a stream running through it". It's pronounced kluf.
To get a more accurate pronunciation, please provide more context. For example, where did you encounter the word "cloux"? What language was it in?