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English definition of “tetrahedron”

tetrahedron

noun [C] uk   /ˌtet.rəˈhiː.drən/ (plural tetrahedrons or tetrahedra   /-drə/   ) specialized us  
a solid shape whose four surfaces are trianglesGeometrical shapesSpherical, circular and annular objects
(Definition of tetrahedron from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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