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trihedron

[ trahy-hee-druhn ]

noun

, Geometry.
, plural tri·he·drons, tri·he·dra [trahy-, hee, -dr, uh].
  1. the figure determined by three planes meeting in a point.

trihedron

/ traɪˈhiːdrən /

noun

  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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Word History and Origins

Origin of trihedron1

First recorded in 1820–30; tri- + -hedron

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trihedraltrihydrate

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