This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of, made of, or containing oats, oatmeal, or oat straw: oaten fodder.

adj. Made of oats

adj. Consisting of an oat straw or stem.

adj. Made of oatmeal.

Made of the stem of the oat.

Made of oats or oatmeal: as, oaten bread.

adj. of or related to or derived from oats

"The sun had far descended, and I still sat on the shore, satisfying my appetite, which had become ravenous, with an oaten cake, when I saw a fishing-boat land close to me, and one of the men brought me a packet; it contained letters from"

oaten pipe   

avenaceous    oaty