diaper
noun
ˈdaɪəpə(r) 
ˈdaɪpər a piece of soft cloth or other thick material that is folded around a baby's bottom and between its legs to absorb and hold its body waste
a diaper rash
Definition of diaper noun from the Oxford Advanced Learner's Dictionary
ˈdaɪəpə(r) ˈdaɪpər 