What does the prefix "intra-" mean in medical terminology?

The prefix "intra-" in medical terminology means "within." It is commonly used to describe processes, structures, or locations that occur inside or within something. For example, the term "intravenous" refers to something that is administered directly within a vein, indicating that the action takes place inside the body, specifically within the circulatory system. The understanding of this prefix is essential for interpreting a variety of medical conditions and treatments accurately.