Before revision: A diaper (, North American English ) or a nappy ( British English, Australian English, and Hiberno-English ) is a type of underwear that allows the wearer to urinate or defecate without using a toilet, by absorbing or containing waste products to prevent soiling of outer clothing or the external environment.
After revision: A diaper (, NAmE ) or a nappy ( BrE, AuE, IrE ) is a type of underwear that allows the wearer to urinate or defecate without using a toilet, by absorbing or containing waste products to prevent soiling of outer clothing or the external environment.