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tetrahedra

 - 4 dictionary results

tet⋅ra⋅he⋅dron

  [te-truh-hee-druhn]
Use tetrahedra in a Sentence
–noun, plural -drons, -dra  [-druh] .
1. Geometry. a solid contained by four plane faces; a triangular pyramid.
2. any of various objects resembling a tetrahedron in the distribution of its faces or apexes.
Origin:
1560–70; tetra- + -hedron, modeled on LGk tetráedron, n. use of neut. of tetráedros four-sided
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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tet·ra·he·dron   (tět'rə-hē'drən)   


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n.   pl. tet·ra·he·drons or tet·ra·he·dra (-drə)
A polyhedron with four faces.

[Late Greek tetraedron, from Greek, neuter of tetraedros, four-faced : tetra-, tetra- + hedrā, face of a geometric solid; see sed- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

tetrahedron 
solid figure contained by four triangular surfaces, 1570, from Late Gk. tetraedron, originally neuter of tetraedros (adj.) "four-sided," from tetra- "four" + hedra "seat, base, chair, face of a geometric solid," from PIE base *sed- "to sit" (see sedentary).
Online Etymology Dictionary, © 2001 Douglas Harper
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Science Dictionary
tetrahedron   (tět'rə-hē'drən)  Pronunciation Key 
Plural tetrahedrons or tetrahedra
A polyhedron having four faces.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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