Dis- is a prefix that means "the opposite of", "not", "lack of", or "removal".
Here are some examples:
* disappear: the opposite of appear
* disagree: not agree
* discomfort: lack of comfort
* disconnect: removal of connection
The prefix "dis-" is commonly used to create the opposite of a word. It's a very versatile prefix and can be applied to many different words.
Let me know if you have any other questions!