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rhomboid

noun [C]
 
 
/ˈrɒm.bɔɪd/ US  /ˈrɑːm-/ specialized

Definition

a type of flat shape with four sides in which the sides next to each other are not of equal length but the sides opposite each other areGeometrical shapesSpherical, circular and annular objects
(Definition of rhomboid noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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