trihedral [trahy-hee-druh l] EXAMPLES|WORD ORIGIN adjective Geometry. having, or formed by, three planes meeting in a point: a trihedral angle. noun a trihedron.

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  • Origin of trihedral First recorded in 1780–90; tri- + -hedral Related formssub·tri·he·dral, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019 Examples from the Web for trihedral Historical Examples of trihedral

  • The angle between two planes is termed dihedral, between three trihedral, between any number more than three polyhedral.

    Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1


  • A triangle and a trihedral angle are therefore reciprocal figures.

    Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6


  • British Dictionary definitions for trihedral trihedral adjective having or formed by three plane faces meeting at a point noun a figure formed by the intersection of three lines in different planes Word Origin for trihedral C18: from tri- + Greek hedra base, seat + -al 1 Collins English Dictionary – Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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