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trihedral

[trahy-hee-druh l] /traɪˈhi drəl/
adjective, Geometry
1.
having, or formed by, three planes meeting in a point:
a trihedral angle.
noun
2.
a trihedron.
Origin
1780-1790
1780-90; tri- + -hedral
Related forms
subtrihedral, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for trihedral

trihedral

/traɪˈhiːdrəl/
adjective
1.
having or formed by three plane faces meeting at a point
noun
2.
a figure formed by the intersection of three lines in different planes
Word Origin
C18: from tri- + Greek hedra base, seat + -al1
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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