It's often used to indicate something that is not what it appears to be, or that is a fake or imitation of something else.
Here are some examples of words with the prefix "pseudes":
* Pseudonym: A false name used by an author.
* Pseudopod: A temporary projection of cytoplasm used by some cells for movement.
* Pseudology: The act of lying or telling falsehoods.
* Pseudoscience: A belief or practice that claims to be scientific but lacks scientific evidence.