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

 

equilateral triangle

 noun
noun
BrE BrE//ˌiːkwɪˌlætərəl ˈtraɪæŋɡl//
 
; NAmE NAmE//ˌiːkwɪˌlætərəl ˈtraɪæŋɡl//
 
(geometry)
 
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a triangle whose three sides are all the same length
See the Oxford Advanced American Dictionary entry: equilateral triangle