"Oatmeal" is a very confusing word to me because it's not actually "meal" (meaning "flour" in this case). There is actually a flour made out of oats, but it's not what you would make porridge out of.
Already the Mycenaean Greeks, 3500 years ago, used a cognate word with the same meaning: "meleuro-".
"Flour", which comes from "flower", originally meant the finest grade of meal, which was considered the best.
Nowadays the usage of these words is not always consistent with their original meanings.
It's not often I find myself quoting Gwar, but this reminds me of "Bone meal! Better than no meal at all!"