oatmeal UK /ˈəʊtmiːl/US /ˈoʊtmil/noun 3adjective 1forms 1 noun3 •Meal made from rolled or round oats. •A breakfast cereal made from rolled oats, cooked in milk or water. •A light greyish brown colour, like that of oatmeal. adjective1 •Of a light greyish brown colour, like that of oatmeal.Boldly patterned textiles in oatmeal tones with a woven design in a strongly contrasting colour can be used alike for upholstery and as a wall hanging […] — 1929 formsoatmeals