What is the meaning of the word "oaten"?

Definitions:

  1. Often used to describe items made from oat flour or containing oats as a primary ingredient. copy to clipboard ADJECTIVE
    • The oaten bread had a slightly nutty flavor and a chewy texture. copy to clipboard
  2. Refers to something made from or pertaining to oats. copy to clipboard ADJECTIVE
    • The hikers packed oaten bars for a quick and nutritious snack on the trail. copy to clipboard