hulled oats flattened between rollers to make oatmeal
rolled oats in American English
plural noun
oats that are hulled and steamed, then flattened by rollers
Word origin
[1885–90, Amer.]This word is first recorded in the period 1885–90. Other words that entered Englishat around the same time include: booster, classified, reactor, toner, twofer