Definition of scalene triangle noun from the Oxford Advanced Learner's Dictionary

 

scalene triangle

 noun
noun
BrE BrE//ˌskeɪliːn ˈtraɪæŋɡl//
 
; NAmE NAmE//ˌskeɪliːn ˈtraɪæŋɡl//
 
(geometry)
 
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a triangle whose sides are all of different lengths
See the Oxford Advanced American Dictionary entry: scalene triangle