-hedron

-hedron

(word root) side, face
Examples of words with the root -hedron: tetrahedron
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree

-hedron

suff.
A crystal or geometric figure having a specified kind or number of surfaces: heptahedron.
[New Latin, from Greek -edron, from neuter of -edros, -sided, from hedrā, face; see sed- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

-hedron

n combining form
(Mathematics) indicating a geometric solid having a specified number of faces or surfaces: tetrahedron.
[from Greek -edron -sided, from hedra seat, base]
-hedral adj combining form
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

-hedron

a combining form used in the names of geometrical solid figures having the form or number of faces specified by the initial element: tetrahedron.
[< Greek -edron, neuter of -edros having bases, -sided, derivative of hédra seat, face of a geometrical form (compare cathedra)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
The four oxygen atoms, seeking maximum separation from each of the other oxygen atoms, can be seen as the points of a four (tetra-) sided (-hedron) solid (Figure 7-4).
In this case, the six oxygen atoms can be seen as the points of an eight (octa-) sided (-hedron) solid (Figure 7-7).