bipyramid


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bipyramid

(ˌbaɪˈpɪrəmɪd)
n
(Mathematics) a geometrical form consisting of two pyramids with a common polygonal base
References in periodicals archive ?
The isolate Btk is quite lethal to lepidopterans and is generally characterized by the production of both bipyramid and cuboidal parasporal crystal proteins (Obeidat et al.
We show that such a polytope is lattice equivalent to a direct sum of del Pezzo polytopes, pseudo del Pezzo polytopes, or a (possibly skew) bipyramid over (pseudo) del Pezzo polytopes.
1[cegrees] vault tetragonal bipyramid P4, a = b = 625, 0.
These are the vertices of a regular triangular bipyramid.
The metal complexes exhibit trigonal bipyramid geometry, which is typical for nonaromatic thiosemicarbazones.
The vanadium atom occupies the center of a distorted trigonal bipyramid, with the ribose oxygen O2' at the apical position.
3 Returning again to the bipyramid B, recall that 15 is both the number of its spanning trees (Example 3.
5 cm, are dull milky white but textbook-sharp, composed about equally of a tetragonal prism and a tetragonal bipyramid, with small basal pinacoid faces topping (and bottoming) off the shape.
The matrix specimens are generally a pink-red and the largest is a hexagonal bipyramid measuring over 4 cm.
Forms include a first-order and second-order prism, two first-order bipyramids, one second order bipyramid and the basal pinacoid.
Morphology: first and second order tetragonal bipyramid and a tetragonal prism.
In a communication dated December 2004, Dr Johnson states "when I was investigating regular-faced solids in the early 1960s, there were no established names even for many of the obvious ones, except for pyramids and bipyramids.