tetrahedral

[te-truh-hee-druhl]
adjective
1.
pertaining to or having the form of a tetrahedron.
2.
having four lateral planes in addition to the top and bottom.

Origin:
1785–95; tetrahedr(on) + -al1

tetrahedrally, adverb
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World English Dictionary
tetrahedron (ˌtɛtrəˈhiːdrən)
 
n , pl -drons, -dra
1.  See also polyhedron a solid figure having four plane faces. A regular tetrahedron has faces that are equilateral triangles
2.  any object shaped like a tetrahedron
 
[C16: from New Latin, from Late Greek tetraedron; see tetra-, -hedron]
 
tetra'hedral
 
adj
 
tetra'hedrally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Because of its tetrahedral structure, diamond also shows a great resistance to compression.
Ammonia seems to have a flattened or exaggerated tetrahedral shape.
Other solids with tetrahedral lattices also float on their melts.
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