How do you drop -al on the word duodenal and than make it a noun?

Here's how you drop "-al" from "duodenal" and make it a noun:

1. Remove the "-al": "duodenal" becomes "duoden"

2. Add a noun suffix: You can add a suffix like "-um" to create the noun "duodenum".

"Duodenum" is the medical term for the first part of the small intestine.