What does affixes intra mean?

"Intra-" is a prefix, not an affix. It means "within" or "inside". It is used to indicate that something is located or happens within a particular place, object, or system.

Here are some examples:

* Intramuscular: within the muscle

* Intracellular: within the cell

* Intravenous: within a vein

* Intranasal: within the nose

* Intrastate: within a state

Let me know if you'd like more examples or have any other questions.