Definition of tutu noun from the Oxford Advanced Learner's Dictionary

 

tutu

 noun
noun
BrE BrE//ˈtuːtuː//
 
; NAmE NAmE//ˈtuːtuː//
 
 
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a ballet dancer’s skirt made of many layers of material. Tutus may be either short and stiff, sticking out from the waist, or long and bell-shaped. Word Origin early 20th cent.: from French, child's alteration of cucu, informal diminutive of cul ‘buttocks’.
See the Oxford Advanced American Dictionary entry: tutu