antiprism

noun
an·​ti·​prism | \¦an-ˌtī-¦pri-zəm, ¦an-tē-\
plural antiprisms

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

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Other Words from antiprism

antiprismatic \¦an-​ˌtī-​priz-​¦ma-​tik, ¦an-​tē-​ \ 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

First Known Use of antiprism

1969, in the meaning defined above

History and Etymology for antiprism

anti- entry 1 + prism

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The first known use of antiprism was in 1969

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