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



BrE BrE//ˈrɒmbəs//
; NAmE NAmE//ˈrɑːmbəs//
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a flat shape with four equal sides and four angles which are not 90° Word Origin mid 16th cent.: via Latin from Greek rhombos.
See the Oxford Advanced American Dictionary entry: rhombus