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trihedron

[trahy-hee-druh n] /traɪˈhi drən/
noun, plural trihedrons, trihedra
[trahy-hee-druh] /traɪˈhi drə/ (Show IPA).
Geometry
1.
the figure determined by three planes meeting in a point.
Also, trihedral.
Origin
1820-1830
1820-30; tri- + -hedron
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for trihedron

trihedron

/traɪˈhiːdrən/
noun (pl) -drons, -dra (-drə)
1.
a figure determined by the intersection of three planes
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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