1. 
   Tetrahedral
   A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.
   Found op http://home.nas.net/~dbc/cic_hamilton/dictionary/a.html
   
   
2. 
   Tetrahedral
   A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.
   Found op http://www.allchemicals.info/index/action/detail/keyword/T/id/1059585136.ph
   
   
3. 
   tetrahedral
   A molecular shape that results when there are four bonds and no lone pairs around the central atom in the molecule. The atoms bonded to the central atom lie at the corners of a tetrahedron with 109.5° angles between them. The ammonium ion (NH₄⁺) has a tetrahedral molecular ge...
   Found op http://antoine.frostburg.edu/chem/senese/101/glossary/t.shtml
   
   
4. 
   Tetrahedral
   Tet`ra·he'dral adjective [ See Tetrahedron .] 1. Having, or composed of, four sides. 2. (Crystallog.) (a) Having the form of the regular tetrahedron. (b) Pertaining or related to a tetrahedron, or to the s...
   Found op http://www.encyclo.co.uk/webster/T/34
   
   
5. 
   tetrahedral
   1. Having, or composed of, four sides. ... 2. <chemistry> Having the form of the regular tetrahedron. Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs. ... <geometry> Tetrahedral angle, a solid angle bounded or inclosed by four...
   Found op http://www.mondofacto.com/facts/dictionary?tetrahedral
   
   
6. 
   Tetrahedral
   • (a.) Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs. • (a.) Having, or composed of, four sides. • (a.) Having the form of the regular tetrahedron.
   Found op http://thinkexist.com/dictionary/meaning/tetrahedral/
   
   
7. 
   Tetrahedral
   A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.
   Found op http://www.chemistry-dictionary.com/definition/tetrahedral.php
   
   

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