Definition of antiprism
: a polyhedron having two faces that are identical polygons in parallel planes but rotated from each other while the other faces are a series of alternately oriented triangles These are the first clusters composed of centered square antiprisms of metal atoms. — Francis J. DiSalvo, Science, 9 Feb. 1990
antiprismatic\¦an-ˌtī-priz-¦ma-tik, ¦an-tē-\ play adjective The ytterbium environment, in keeping with the diminished ionic radius, is now eight-coordinate with a square-antiprismatic arrangement. — Glen B. Deacon et al., Canadian Journal Of Chemistry, 1 Jan. 2009
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