It comes from the Latin word "cauda," meaning "tail."
You'll often see it used in anatomical terms like:
* Caudal fin: The fin located at the tail end of a fish.
* Caudal vertebra: The bones in the tail of a vertebrate animal.
* Caudal anesthesia: Anesthesia administered near the tailbone.
So, anytime you see "caudal," think "tail"!