TETRAHEDRON


Meaning of TETRAHEDRON in English

/ ˌtetrəˈhiːdrən; NAmE ; -ˈhed-/ noun

( geometry ) a solid shape with four flat sides that are triangles

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WORD ORIGIN

late 16th cent.: from late Greek tetraedron , neuter (used as a noun) of tetraedros four-sided.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.